<!-- This file is automatically generated using maintenance/generateConfigDoc.php. -->
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This is a list of configuration variables that can be set in LocalSettings.php.

[TOC]

# ConfigRegistry {#ConfigRegistry}
Registry of factory functions to create config objects:
The 'main' key must be set, and the value should be a valid
callable.
@since 1.23

# Sitename {#Sitename}
Name of the site. It must be changed in LocalSettings.php

# Server {#Server}
URL of the server.

**Example:**
```
$wgServer = 'http://example.com';
```

This must be set in LocalSettings.php. The MediaWiki installer does this
automatically since 1.18.

If you want to use protocol-relative URLs on your wiki, set this to a
protocol-relative URL like '//example.com' and set $wgCanonicalServer
to a fully qualified URL.

# CanonicalServer {#CanonicalServer}
Canonical URL of the server, to use in IRC feeds and notification e-mails.

Must be fully qualified, even if $wgServer is protocol-relative.

Defaults to $wgServer, expanded to a fully qualified http:// URL if needed.
@since 1.18

# ServerName {#ServerName}
Server name. This is automatically computed by parsing the bare
hostname out of $wgCanonicalServer. It should not be customized.
@since 1.24

# AssumeProxiesUseDefaultProtocolPorts {#AssumeProxiesUseDefaultProtocolPorts}
When the wiki is running behind a proxy and this is set to true, assumes that the proxy exposes
the wiki on the standard ports (443 for https and 80 for http).
@since 1.26

# HttpsPort {#HttpsPort}
For installations where the canonical server is HTTP but HTTPS is optionally
supported, you can specify a non-standard HTTPS port here. $wgServer should
be a protocol-relative URL.

If HTTPS is always used, just specify the port number in $wgServer.
@see https://phabricator.wikimedia.org/T67184
@since 1.24

# ForceHTTPS {#ForceHTTPS}
If this is true, when an insecure HTTP request is received, always redirect
to HTTPS. This overrides and disables the preferhttps user preference, and it
overrides $wgSecureLogin.

$wgServer may be either https or protocol-relative. If $wgServer starts with
"http://", an exception will be thrown.

If a reverse proxy or CDN is used to forward requests from HTTPS to HTTP,
the request header "X-Forwarded-Proto: https" should be sent to suppress
the redirect.

In addition to setting this to true, for optimal security, the web server
should also be configured to send Strict-Transport-Security response headers.
@since 1.35

# ScriptPath {#ScriptPath}
The path we should point to.

It might be a virtual path in case with use apache mod_rewrite for example.

This *needs* to be set correctly.

Other paths will be set to defaults based on it unless they are directly
set in LocalSettings.php

# UsePathInfo {#UsePathInfo}
Whether to support URLs like index.php/Page_title.
The effective default value is determined at runtime:
it will be enabled in environments where it is expected to be safe.

Override this to false if $_SERVER['PATH_INFO'] contains unexpectedly
incorrect garbage, or to true if it is really correct.

The default $wgArticlePath will be set based on this value at runtime, but if
you have customized it, having this incorrectly set to true can cause
redirect loops when "pretty URLs" are used.
@since 1.2.1

# Script {#Script}
The URL path to index.php.

Defaults to "{$wgScriptPath}/index.php".

# LoadScript {#LoadScript}
The URL path to load.php.

Defaults to "{$wgScriptPath}/load.php".
@since 1.17

# RestPath {#RestPath}
The URL path to the REST API
Defaults to "{$wgScriptPath}/rest.php"
@since 1.34

# StylePath {#StylePath}
The URL path of the skins directory.

Defaults to "{$wgResourceBasePath}/skins".
@since 1.3

# LocalStylePath {#LocalStylePath}
The URL path of the skins directory. Should not point to an external domain.

Defaults to "{$wgScriptPath}/skins".
@since 1.17

# ExtensionAssetsPath {#ExtensionAssetsPath}
The URL path of the extensions directory.

Defaults to "{$wgResourceBasePath}/extensions".
@since 1.16

# ExtensionDirectory {#ExtensionDirectory}
Extensions directory in the file system.
@note Set to "{$IP}/extensions" by Setup.php before loading local settings.
@note this configuration variable is used to locate extensions while loading settings.
@since 1.25

# StyleDirectory {#StyleDirectory}
Skins directory in the file system.
@note Set to "{$IP}/skins" by Setup.php before loading local settings.
@note this configuration variable is used to locate skins while loading settings.
@since 1.3

# BaseDirectory {#BaseDirectory}
Absolute filesystem path of the root directory of the MediaWiki installation.
The MW_INSTALL_PATH environment variable can be used to set this.

@note Automatically set in Setup.php before loading local settings.
@note Do not modify in settings files! Must remain equal to the MW_INSTALL_PATH constant
defined in Setup.php.
@since 1.38

# ArticlePath {#ArticlePath}
The URL path for primary article page views. This path should contain $1,
which is replaced by the article title.

Defaults to "{$wgScript}/$1" or "{$wgScript}?title=$1",
depending on $wgUsePathInfo.

# UploadPath {#UploadPath}
The URL path for the images directory.

Defaults to "{$wgScriptPath}/images".

# ImgAuthPath {#ImgAuthPath}
The base path for img_auth.php. This is used to interpret the request URL
for requests to img_auth.php that do not match the base upload path. If
false, "{$wgScriptPath}/img_auth.php" is used.

Normally, requests to img_auth.php have a REQUEST_URI which matches
$wgUploadPath, and in that case, setting this should not be necessary.
This variable is used in case img_auth.php is accessed via a different path
than $wgUploadPath.
@since 1.35

# ThumbPath {#ThumbPath}
The base path for thumb_handler.php. This is used to interpret the request URL
for requests to thumb_handler.php that do not match the base upload path.
@since 1.36

# UploadDirectory {#UploadDirectory}
The filesystem path of the images directory. Defaults to "{$IP}/images".

# FileCacheDirectory {#FileCacheDirectory}
Directory where the cached page will be saved.

Defaults to "{$wgUploadDirectory}/cache".

# Logo {#Logo}
The URL path of the wiki logo. The logo size should be 135x135 pixels.

Defaults to "$wgResourceBasePath/resources/assets/change-your-logo.svg".
Developers should retrieve this logo (and other variants) using
  the static function ResourceLoaderSkinModule::getAvailableLogos
Ignored if $wgLogos is set.

# Logos {#Logos}
Specification for different versions of the wiki logo.

This is an array which should have the following k/v pairs:
All path values can be either absolute or relative URIs

The `1x` key is a path to the 1x version of square logo (should be 135x135 pixels)
The `1.5x` key is a path to the 1.5x version of square logo
The `2x` key is a path to the 2x version of square logo
The `svg` key is a path to the svg version of square logo
The `icon` key is a path to the version of the logo without wordmark and tagline
The `wordmark` key should point to an array with the following fields
 - `src` path to wordmark version
 - `1x` path to svg wordmark version (if you want to
		   support browsers with SVG support with an SVG logo)
 - `width` width of the logo in pixels
 - `height` height of the logo in pixels
The `tagline` key should point to an array with the following fields
 - `src` path to tagline image
 - `width` width of the tagline in pixels
 - `height` height of the tagline in pixels

**Example:**

```
$wgLogos = [
  '1x' => 'path/to/1x_version.png',
  '1.5x' => 'path/to/1.5x_version.png',
  '2x' => 'path/to/2x_version.png',
  'svg' => 'path/to/svg_version.svg',
  'icon' => 'path/to/icon.png',
  'wordmark' => [
  	'src' => 'path/to/wordmark_version.png',
  	'1x' => 'path/to/wordmark_version.svg',
  	'width' => 135,
  	'height' => 20,
  ],
  'tagline' => [
  	'src' => 'path/to/tagline_version.png',
  	'width' => 135,
	'height' => 15,
   ]
];
```
Defaults to [ "1x" => $wgLogo ], or [ "1x" => "$wgResourceBasePath/resources/assets/change-your-logo.svg" ]
if $wgLogo is not set.
@since 1.35

# LogoHD {#LogoHD}
Array with URL paths to HD versions of the wiki logo. The scaled logo size
should be under 135x155 pixels.

Only 1.5x and 2x versions are supported.

**Example:**

```
$wgLogoHD = [
"1.5x" => "path/to/1.5x_version.png",
"2x" => "path/to/2x_version.png"
];
```

SVG is also supported but when enabled, it
disables 1.5x and 2x as svg will already
be optimised for screen resolution.

**Example:**

```
$wgLogoHD = [
"svg" => "path/to/svg_version.svg",
];
```
@since 1.25
@deprecated since 1.35. Developers should retrieve this logo (and other variants) using
the static function ResourceLoaderSkinModule::getAvailableLogos. $wgLogos should be used
instead.

# Favicon {#Favicon}
The URL path of the shortcut icon.
@since 1.6

# AppleTouchIcon {#AppleTouchIcon}
The URL path of the icon for iPhone and iPod Touch web app bookmarks.

Defaults to no icon.
@since 1.12

# ReferrerPolicy {#ReferrerPolicy}
Value for the referrer policy meta tag.

One or more of the values defined in the Referrer Policy specification:
https://w3c.github.io/webappsec-referrer-policy/
('no-referrer', 'no-referrer-when-downgrade', 'same-origin',
'origin', 'strict-origin', 'origin-when-cross-origin',
'strict-origin-when-cross-origin', or 'unsafe-url')
Setting it to false prevents the meta tag from being output
(which results in falling back to the Referrer-Policy header,
or 'no-referrer-when-downgrade' if that's not set either.)
Setting it to an array (supported since 1.31) will create a meta tag for
each value, in the reverse of the order (meaning that the first array element
will be the default and the others used as fallbacks for browsers which do not
understand it).
@since 1.25

# TmpDirectory {#TmpDirectory}
The local filesystem path to a temporary directory. This must not be web accessible.

When this setting is set to false, its value will automatically be decided
through the first call to wfTempDir(). See that method's implementation for
the actual detection logic.

To find the temporary path for the current wiki, developers must not use
this variable directly. Use the global function wfTempDir() instead.

The temporary directory is expected to be shared with other applications,
including other MediaWiki instances (which might not run the same version
or configution). When storing files here, take care to avoid conflicts
with other instances of MediaWiki. For example, when caching the result
of a computation, the file name should incorporate the input of the
computation so that it cannot be confused for the result of a similar
computation by another MediaWiki instance.
@see \wfTempDir()
@note Default changed to false in MediaWiki 1.20.

# UploadBaseUrl {#UploadBaseUrl}
If set, this URL is added to the start of $wgUploadPath to form a complete
upload URL.
@since 1.4

# UploadStashScalerBaseUrl {#UploadStashScalerBaseUrl}
To enable remote on-demand scaling, set this to the thumbnail base URL.

Full thumbnail URL will be like $wgUploadStashScalerBaseUrl/e/e6/Foo.jpg/123px-Foo.jpg
where 'e6' are the first two characters of the MD5 hash of the file name.
@deprecated since 1.36 Use thumbProxyUrl in $wgLocalFileRepo

If $wgUploadStashScalerBaseUrl and thumbProxyUrl are both false, thumbs are
rendered locally as needed.
@since 1.17

# ActionPaths {#ActionPaths}
To set 'pretty' URL paths for actions other than
plain page views, add to this array.

**Example:**
Set pretty URL for the edit action:

```
'edit' => "$wgScriptPath/edit/$1"
```
There must be an appropriate script or rewrite rule in place to handle these URLs.
@since 1.5

# MainPageIsDomainRoot {#MainPageIsDomainRoot}
Option to whether serve the main page as the domain root
@warning EXPERIMENTAL!
@since 1.34

# EnableUploads {#EnableUploads}
Allow users to upload files.

Use $wgLocalFileRepo to control how and where uploads are stored.
Disabled by default as for security reasons.
See <https://www.mediawiki.org/wiki/Manual:Configuring_file_uploads>.
@since 1.5

# UploadStashMaxAge {#UploadStashMaxAge}
The maximum age of temporary (incomplete) uploaded files

# EnableAsyncUploads {#EnableAsyncUploads}
Enable deferred upload tasks that use the job queue.

Only enable this if job runners are set up for both the
'AssembleUploadChunks' and 'PublishStashedFile' job types.
@note If you use suhosin, this setting is incompatible with
suhosin.session.encrypt.

# UploadMaintenance {#UploadMaintenance}
To disable file delete/restore temporarily

# IllegalFileChars {#IllegalFileChars}
Additional characters that are not allowed in filenames. They are replaced with '-' when
uploading. Like $wgLegalTitleChars, this is a regexp character class.

Slashes and backslashes are disallowed regardless of this setting, but included here for
completeness.

# DeletedDirectory {#DeletedDirectory}
What directory to place deleted uploads in.

Defaults to "{$wgUploadDirectory}/deleted".

# ImgAuthDetails {#ImgAuthDetails}
Set this to true if you use img_auth and want the user to see details on why access failed.

# ImgAuthUrlPathMap {#ImgAuthUrlPathMap}
Map of relative URL directories to match to internal mwstore:// base storage paths.

For img_auth.php requests, everything after "img_auth.php/" is checked to see
if starts with any of the prefixes defined here. The prefixes should not overlap.
The prefix that matches has a corresponding storage path, which the rest of the URL
is assumed to be relative to. The file at that path (or a 404) is send to the client.

Example:
$wgImgAuthUrlPathMap['/timeline/'] = 'mwstore://local-fs/timeline-render/';
The above maps ".../img_auth.php/timeline/X" to "mwstore://local-fs/timeline-render/".
The name "local-fs" should correspond by name to an entry in $wgFileBackends.
@see $wgFileBackends

# LocalFileRepo {#LocalFileRepo}
File repository structures

$wgLocalFileRepo is a single repository structure, and $wgForeignFileRepos is
an array of such structures. Each repository structure is an associative
array of properties configuring the repository.

Properties required for all repos:
  - class            The class name for the repository. May come from the core or an extension.
                     The core repository classes are FileRepo, LocalRepo, ForeignDBRepo.

  - name             A unique name for the repository (but $wgLocalFileRepo should be 'local').
                     The name should consist of alpha-numeric characters.

Optional common properties:
  - backend          A file backend name (see $wgFileBackends). If not specified, or
                     if the name is not present in $wgFileBackends, an FSFileBackend
                     will automatically be configured.
  - lockManager      If a file backend is automatically configured, this will be lock
                     manager name used. A lock manager named in $wgLockManagers, or one of
                     the default lock managers "fsLockManager" or "nullLockManager". Default
                     "fsLockManager".

For most core repos:
  - zones            Associative array of zone names that each map to an array with:
                         container  : backend container name the zone is in
                         directory  : root path within container for the zone
                         url        : base URL to the root of the zone
                         urlsByExt  : map of file extension types to base URLs
                                      (useful for using a different cache for videos)
                     Zones default to using "<repo name>-<zone name>" as the container name
                     and default to using the container root as the zone's root directory.
                     Nesting of zone locations within other zones should be avoided.
  - url              Public zone URL. The 'zones' settings take precedence.
  - hashLevels       The number of directory levels for hash-based division of files.

                     Set this to 0 if you do not want MediaWiki to divide your images
                     directory into many subdirectories.

                     It is recommended to leave this enabled. In previous versions of
                     MediaWiki, some users set this to false to allow images to be added to
                     the wiki by copying them into $wgUploadDirectory and then running
                     maintenance/rebuildImages.php to register them in the database.
                     This is no longer supported, use maintenance/importImages.php instead.

                     Default: 2.
  - deletedHashLevels
                     Optional 'hashLevels' override for the 'deleted' zone.
  - thumbScriptUrl   The URL for thumb.php (optional, not recommended)
  - transformVia404  Whether to skip media file transformation on parse and rely on a 404
                     handler instead.
  - thumbProxyUrl    Optional. URL of where to proxy thumb.php requests to. This is
                     also used internally for remote thumbnailing of upload stash files.
                     Example: http://127.0.0.1:8888/wiki/dev/thumb/
  - thumbProxySecret Optional value of the X-Swift-Secret header to use in requests to
                     thumbProxyUrl
  - disableLocalTransform
                     If present and true, local image scaling will be disabled -- it will
                     throw an exception if attempted. thumbProxyUrl must be set for this
                     to work, as well as either transformVia404 (preferred) or thumbScriptUrl.
  - initialCapital   Equivalent to $wgCapitalLinks (or $wgCapitalLinkOverrides[NS_FILE],
                     determines whether filenames implicitly start with a capital letter.
                     The current implementation may give incorrect description page links
                     when the local $wgCapitalLinks and initialCapital are mismatched.
  - pathDisclosureProtection
                     May be 'paranoid' to remove all parameters from error messages, 'none' to
                     leave the paths in unchanged, or 'simple' to replace paths with
                     placeholders. Default for LocalRepo is 'simple'.
  - fileMode         This allows wikis to set the file mode when uploading/moving files. Default
                     is 0644.
  - directory        The local filesystem directory where public files are stored. Not used for
                     some remote repos.
  - thumbDir         The base thumbnail directory. Defaults to "<directory>/thumb".
  - thumbUrl         The base thumbnail URL. Defaults to "<url>/thumb".
  - isPrivate        Set this if measures should always be taken to keep the files private.
                     One should not trust this to assure that the files are not web readable;
                     the server configuration should be done manually depending on the backend.
  - useJsonMetadata  Whether handler metadata should be stored in JSON format. Default: false.
  - useSplitMetadata Whether handler metadata should be split up and stored in the text table.
                     Default: false.
  - splitMetadataThreshold
                     If the media handler opts in, large metadata items will be split into a
                     separate blob in the database if the item is larger than this threshold.
                     Default: 1000
  - updateCompatibleMetadata
                     When true, image metadata will be upgraded by reloading it from the original
                     file, if the handler indicates that it is out of date.

                     By default, when purging a file or otherwise refreshing file metadata, it
                     is only reloaded when the metadata is invalid. Valid data originally loaded
                     by a current or older compatible version is left unchanged. Enable this
                     to also reload and upgrade metadata that was stored by an older compatible
                     version. See also MediaHandler::isMetadataValid, and RefreshImageMetadata.

                     Default: false.

  - reserializeMetadata
                     If true, image metadata will be automatically rewritten to the database
                     if its serialization format is out of date. Default: false

These settings describe a foreign MediaWiki installation. They are optional, and will be ignored
for local repositories:
  - descBaseUrl       URL of image description pages, e.g. https://en.wikipedia.org/wiki/File:
  - scriptDirUrl      URL of the MediaWiki installation, equivalent to $wgScriptPath, e.g.
                      https://en.wikipedia.org/w
  - articleUrl        Equivalent to $wgArticlePath, e.g. https://en.wikipedia.org/wiki/$1
  - fetchDescription  Fetch the text of the remote file description page and display them
                      on the local wiki.
  - abbrvThreshold    File names over this size will use the short form of thumbnail names.
                      Short thumbnail names only have the width, parameters, and the extension.

ForeignDBRepo:
  - dbType, dbServer, dbUser, dbPassword, dbName, dbFlags
                      equivalent to the corresponding member of $wgDBservers
  - tablePrefix       Table prefix, the foreign wiki's $wgDBprefix
  - hasSharedCache    Set to true if the foreign wiki's $wgMainCacheType is identical to,
                      and accessible from, this wiki.

ForeignAPIRepo:
  - apibase              Use for the foreign API's URL
  - apiThumbCacheExpiry  How long to locally cache thumbs for

If you leave $wgLocalFileRepo set to false, Setup will fill in appropriate values.
Otherwise, set $wgLocalFileRepo to a repository structure as described above.
If you set $wgUseInstantCommons to true, it will add an entry for Commons.
If you set $wgForeignFileRepos to an array of repository structures, those will
be searched after the local file repo.
Otherwise, you will only have access to local media files.
@see \FileRepo::__construct for the default options.
@see Setup.php for an example usage and default initialization.

# ForeignFileRepos {#ForeignFileRepos}
Enable the use of files from one or more other wikis.

If you operate multiple wikis, you can declare a shared upload path here.
Uploads to the local wiki will NOT be stored here - See $wgLocalFileRepo
and $wgUploadDirectory for that.

The wiki will only consider the foreign repository if no file of the given name
is found in the local repository (e.g. via `[[File:..]]` syntax).
@since 1.11
@see $wgLocalFileRepo

# UseInstantCommons {#UseInstantCommons}
Use Wikimedia Commons as a foreign file repository.

This is a shortcut for adding an entry to $wgForeignFileRepos
for https://commons.wikimedia.org, using ForeignAPIRepo with the
default settings.
@since 1.16

# UseSharedUploads {#UseSharedUploads}
Shortcut for adding an entry to $wgForeignFileRepos.

Uses the following variables:

- directory: $wgSharedUploadDirectory.
- url: $wgSharedUploadPath.
- hashLevels: Based on $wgHashedSharedUploadDirectory.
- thumbScriptUrl: $wgSharedThumbnailScriptPath.
- transformVia404: Based on $wgGenerateThumbnailOnParse.
- descBaseUrl: $wgRepositoryBaseUrl.
- fetchDescription: $wgFetchCommonsDescriptions.

If $wgSharedUploadDBname is set, it uses the ForeignDBRepo
class, with also the following variables:

- dbName: $wgSharedUploadDBname.
- dbType: $wgDBtype.
- dbServer: $wgDBserver.
- dbUser: $wgDBuser.
- dbPassword: $wgDBpassword.
- dbFlags: Based on $wgDebugDumpSql.
- tablePrefix: $wgSharedUploadDBprefix,
- hasSharedCache: $wgCacheSharedUploads.
@since 1.3

# SharedUploadDirectory {#SharedUploadDirectory}
Shortcut for the 'directory' setting of $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.3

# SharedUploadPath {#SharedUploadPath}
Shortcut for the 'url' setting of $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.3

# HashedSharedUploadDirectory {#HashedSharedUploadDirectory}
Shortcut for the 'hashLevels' setting of $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.3

# RepositoryBaseUrl {#RepositoryBaseUrl}
Shortcut for the 'descBaseUrl' setting of $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.5

# FetchCommonsDescriptions {#FetchCommonsDescriptions}
Shortcut for the 'fetchDescription' setting of $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.5

# SharedUploadDBname {#SharedUploadDBname}
Shortcut for the ForeignDBRepo 'dbName' setting in $wgForeignFileRepos.

Set this to false if the uploads do not come from a wiki.
Only used if $wgUseSharedUploads is enabled.
@since 1.4

# SharedUploadDBprefix {#SharedUploadDBprefix}
Shortcut for the ForeignDBRepo 'tablePrefix' setting in $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.5

# CacheSharedUploads {#CacheSharedUploads}
Shortcut for the ForeignDBRepo 'hasSharedCache' setting in $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.5

# ForeignUploadTargets {#ForeignUploadTargets}
Array of foreign file repo names (set in $wgForeignFileRepos above) that
are allowable upload targets. These wikis must have some method of
authentication (i.e. CentralAuth), and be CORS-enabled for this wiki.

The string 'local' signifies the default local file repository.

Example:
$wgForeignUploadTargets = [ 'shared' ];

# UploadDialog {#UploadDialog}
Configuration for file uploads using the embeddable upload dialog
(https://www.mediawiki.org/wiki/Upload_dialog).

This applies also to foreign uploads to this wiki (the configuration is loaded by remote wikis
using the action=query&meta=siteinfo API).

See below for documentation of each property. None of the properties may be omitted.

# FileBackends {#FileBackends}
File backend structure configuration.

This is an array of file backend configuration arrays.
Each backend configuration has the following parameters:
 - name        : A unique name for the backend
 - class       : The file backend class to use
 - wikiId      : A unique string that identifies the wiki (container prefix)
 - lockManager : The name of a lock manager (see $wgLockManagers) [optional]

See FileBackend::__construct() for more details.
Additional parameters are specific to the file backend class used.
These settings should be global to all wikis when possible.

FileBackendMultiWrite::__construct() is augmented with a 'template' option that
can be used in any of the values of the 'backends' array. Its value is the name of
another backend in $wgFileBackends. When set, it pre-fills the array with all of the
configuration of the named backend. Explicitly set values in the array take precedence.

There are two particularly important aspects about each backend:
  - a) Whether it is fully qualified or wiki-relative.
       By default, the paths of files are relative to the current wiki,
       which works via prefixing them with the current wiki ID when accessed.
       Setting 'domainId' forces the backend to be fully qualified by prefixing
       all paths with the specified value instead. This can be useful if
       multiple wikis need to share the same data. Note that 'name' is *not*
       part of any prefix and thus should not be relied upon for namespacing.
  - b) Whether it is only defined for some wikis or is defined on all
       wikis in the wiki farm. Defining a backend globally is useful
       if multiple wikis need to share the same data.
One should be aware of these aspects when configuring a backend for use with
any basic feature or plugin. For example, suppose an extension stores data for
different wikis in different directories and sometimes needs to access data from
a foreign wiki's directory in order to render a page on given wiki. The extension
would need a fully qualified backend that is defined on all wikis in the wiki farm.

# LockManagers {#LockManagers}
List of lock manager backend configurations.

Each backend configuration has the following parameters:
 - name  : A unique name for the lock manager
 - class : The lock manger class to use

See LockManager::__construct() for more details.
Additional parameters are specific to the lock manager class used.
These settings should be global to all wikis.

# ShowEXIF {#ShowEXIF}
Whether to show Exif data.
The effective default value is determined at runtime:
enabled if PHP's EXIF extension module is loaded.

Requires PHP's Exif extension: https://www.php.net/manual/en/ref.exif.php
@note FOR WINDOWS USERS:
To enable Exif functions, add the following line to the "Windows
extensions" section of php.ini:

```
{.ini}
extension=extensions/php_exif.dll
```

# UpdateCompatibleMetadata {#UpdateCompatibleMetadata}
Shortcut for the 'updateCompatibleMetadata' setting of $wgLocalFileRepo.

# AllowCopyUploads {#AllowCopyUploads}
Allow for upload to be copied from an URL.

The timeout for copy uploads is set by $wgCopyUploadTimeout.
You have to assign the user right 'upload_by_url' to a user group, to use this.

# CopyUploadsDomains {#CopyUploadsDomains}
A list of domains copy uploads can come from
@since 1.20

# CopyUploadsFromSpecialUpload {#CopyUploadsFromSpecialUpload}
Enable copy uploads from Special:Upload. $wgAllowCopyUploads must also be
true. If $wgAllowCopyUploads is true, but this is false, you will only be
able to perform copy uploads from the API or extensions (e.g. UploadWizard).

# CopyUploadProxy {#CopyUploadProxy}
Proxy to use for copy upload requests.
@since 1.20

# CopyUploadTimeout {#CopyUploadTimeout}
Different timeout for upload by url
This could be useful since when fetching large files, you may want a
timeout longer than the default $wgHTTPTimeout. False means fallback
to default.
@since 1.22

# MaxUploadSize {#MaxUploadSize}
Max size for uploads, in bytes.

If not set to an array, applies to all uploads. If set to an array, per upload
type maximums can be set, using the file and url keys. If the `*` key is set
this value will be used as maximum for non-specified types.

The below example would set the maximum for all uploads to 250 KiB except,
for upload-by-url, which would have a maximum of 500 KiB.

**Example:**

```
$wgMaxUploadSize = [
    '*' => 250 * 1024,
    'url' => 500 * 1024,
];
```
Default: 100 MiB.

# MinUploadChunkSize {#MinUploadChunkSize}
Minimum upload chunk size, in bytes.

When using chunked upload, non-final chunks smaller than this will be rejected.

Note that this may be further reduced by the `upload_max_filesize` and
`post_max_size` PHP settings. Use ApiUpload::getMinUploadChunkSize to
get the effective minimum chunk size used by MediaWiki.

Default: 1 KiB.
@since 1.26
@see \ApiUpload::getMinUploadChunkSize

# UploadNavigationUrl {#UploadNavigationUrl}
Point the upload navigation link to an external URL
Useful if you want to use a shared repository by default
without disabling local uploads (use $wgEnableUploads = false for that).

**Example:**

```
$wgUploadNavigationUrl = 'https://commons.wikimedia.org/wiki/Special:Upload';
```

# UploadMissingFileUrl {#UploadMissingFileUrl}
Point the upload link for missing files to an external URL, as with
$wgUploadNavigationUrl. The URL will get "(?|&)wpDestFile=<filename>"
appended to it as appropriate.

# ThumbnailScriptPath {#ThumbnailScriptPath}
Give a path here to use thumb.php for thumbnail generation on client
request, instead of generating them on render and outputting a static URL.

This is necessary if some of your apache servers don't have read/write
access to the thumbnail path.

**Example:**

```
$wgThumbnailScriptPath = "{$wgScriptPath}/thumb.php";
```

# SharedThumbnailScriptPath {#SharedThumbnailScriptPath}
Shortcut for the 'thumbScriptUrl' setting of $wgForeignFileRepos.

Only used if $wgUseSharedUploads is enabled.
@since 1.3

# HashedUploadDirectory {#HashedUploadDirectory}
Shortcut for setting `hashLevels=2` in $wgLocalFileRepo.
@note Only used if $wgLocalFileRepo is not set.

# FileExtensions {#FileExtensions}
This is the list of preferred extensions for uploading files. Uploading files
with extensions not in this list will trigger a warning.
@warning If you add any OpenOffice or Microsoft Office file formats here,
such as odt or doc, and untrusted users are allowed to upload files, then
your wiki will be vulnerable to cross-site request forgery (CSRF).

# ProhibitedFileExtensions {#ProhibitedFileExtensions}
Files with these extensions will never be allowed as uploads.

An array of file extensions to prevent being uploaded. You should
append to this array if you want to prevent additional file extensions.
@since 1.37; previously $wgFileBlacklist

# MimeTypeExclusions {#MimeTypeExclusions}
Files with these MIME types will never be allowed as uploads
if $wgVerifyMimeType is enabled.
@since 1.37; previously $wgMimeTypeBlacklist

# AllowJavaUploads {#AllowJavaUploads}
Allow Java archive uploads.

This is not recommended for public wikis since a maliciously-constructed
applet running on the same domain as the wiki can steal the user's cookies.

# CheckFileExtensions {#CheckFileExtensions}
This is a flag to determine whether or not to check file extensions on upload.
@warning Setting this to false is insecure for public wikis.

# StrictFileExtensions {#StrictFileExtensions}
If this is turned off, users may override the warning for files not covered
by $wgFileExtensions.
@warning Setting this to false is insecure for public wikis.

# DisableUploadScriptChecks {#DisableUploadScriptChecks}
Setting this to true will disable the upload system's checks for HTML/JavaScript.
@warning THIS IS VERY DANGEROUS on a publicly editable site, so USE
$wgGroupPermissions TO RESTRICT UPLOADING to only those that you trust

# UploadSizeWarning {#UploadSizeWarning}
Warn if uploaded files are larger than this (in bytes), or false to disable

# TrustedMediaFormats {#TrustedMediaFormats}
list of trusted media-types and MIME types.

Use the MEDIATYPE_xxx constants to represent media types.
This list is used by File::isSafeFile

Types not listed here will have a warning about unsafe content
displayed on the images description page. It would also be possible
to use this for further restrictions, like disabling direct
[[media:...]] links for non-trusted formats.

# MediaHandlers {#MediaHandlers}
Plugins for media file type handling.

Each entry in the array maps a MIME type to a class name

Core media handlers are listed in MediaHandlerFactory,
and extensions should use extension.json.

# NativeImageLazyLoading {#NativeImageLazyLoading}
Toggles native image lazy loading, via the "loading" attribute.
@warning EXPERIMENTAL!
@since 1.34

# ParserTestMediaHandlers {#ParserTestMediaHandlers}
Media handler overrides for parser tests (they don't need to generate actual
thumbnails, so a mock will do)

# UseImageResize {#UseImageResize}
Whether to enable server-side image thumbnailing. If false, images will
always be sent to the client in full resolution, with appropriate width= and
height= attributes on the <img> tag for the client to do its own scaling.

# UseImageMagick {#UseImageMagick}
Resizing can be done using PHP's internal image libraries or using
ImageMagick or another third-party converter, e.g. GraphicMagick.

These support more file formats than PHP, which only supports PNG,
GIF, JPG, XBM and WBMP.

Use Image Magick instead of PHP builtin functions.

# ImageMagickConvertCommand {#ImageMagickConvertCommand}
The convert command shipped with ImageMagick

# MaxInterlacingAreas {#MaxInterlacingAreas}
Array of max pixel areas for interlacing per MIME type
@since 1.27

# SharpenParameter {#SharpenParameter}
Sharpening parameter to ImageMagick

# SharpenReductionThreshold {#SharpenReductionThreshold}
Reduction in linear dimensions below which sharpening will be enabled

# ImageMagickTempDir {#ImageMagickTempDir}
Temporary directory used for ImageMagick. The directory must exist. Leave
this set to false to let ImageMagick decide for itself.

# CustomConvertCommand {#CustomConvertCommand}
Use another resizing converter, e.g. GraphicMagick
%s will be replaced with the source path, %d with the destination
%w and %h will be replaced with the width and height.

**Example for GraphicMagick:**

```
$wgCustomConvertCommand = "gm convert %s -resize %wx%h %d"
```
Leave as false to skip this.

# JpegTran {#JpegTran}
used for lossless jpeg rotation
@since 1.21

# JpegPixelFormat {#JpegPixelFormat}
At default setting of 'yuv420', JPEG thumbnails will use 4:2:0 chroma
subsampling to reduce file size, at the cost of possible color fringing
at sharp edges.

See https://en.wikipedia.org/wiki/Chroma_subsampling

Supported values:
  false - use scaling system's default (same as pre-1.27 behavior)
  'yuv444' - luma and chroma at same resolution
  'yuv422' - chroma at 1/2 resolution horizontally, full vertically
  'yuv420' - chroma at 1/2 resolution in both dimensions

This setting is currently supported only for the ImageMagick backend;
others may default to 4:2:0 or 4:4:4 or maintaining the source file's
sampling in the thumbnail.
@since 1.27

# JpegQuality {#JpegQuality}
When scaling a JPEG thumbnail, this is the quality we request
from the backend. It should be an integer between 1 and 100,
with 100 indicating 100% quality.
@since 1.32

# Exiv2Command {#Exiv2Command}
Some tests and extensions use exiv2 to manipulate the Exif metadata in some
image formats.

# Exiftool {#Exiftool}
Path to exiftool binary. Used for lossless ICC profile swapping.
@since 1.26

# SVGConverters {#SVGConverters}
Scalable Vector Graphics (SVG) may be uploaded as images.

Since SVG support is not yet standard in browsers, it is
necessary to rasterize SVGs to PNG as a fallback format.

An external program is required to perform this conversion.
If set to an array, the first item is a PHP callable and any further items
are passed as parameters after $srcPath, $dstPath, $width, $height

# SVGConverter {#SVGConverter}
Pick a converter defined in $wgSVGConverters

# SVGConverterPath {#SVGConverterPath}
If not in the executable PATH, specify the SVG converter path.

# SVGMaxSize {#SVGMaxSize}
Don't scale a SVG larger than this

# SVGMetadataCutoff {#SVGMetadataCutoff}
Don't read SVG metadata beyond this point.

Default is 1024*256 bytes

# MediaInTargetLanguage {#MediaInTargetLanguage}
Whether thumbnails should be generated in target language (usually, same as
page language), if available.

Currently, applies only to SVG images that use the systemLanguage attribute
to specify text language.
@since 1.33

# MaxImageArea {#MaxImageArea}
The maximum number of pixels a source image can have if it is to be scaled
down by a scaler that requires the full source image to be decompressed
and stored in decompressed form, before the thumbnail is generated.

This provides a limit on memory usage for the decompression side of the
image scaler. The limit is used when scaling PNGs with any of the
built-in image scalers, such as ImageMagick or GD. It is ignored for
JPEGs with ImageMagick, and when using the VipsScaler extension.

If set to false, MediaWiki will not check the size of the image before
attempting to scale it. Extensions may still override this setting by
using the BitmapHandlerCheckImageArea hook.

The default is 50 MB if decompressed to RGBA form, which corresponds to
12.5 million pixels or 3500x3500.

# MaxAnimatedGifArea {#MaxAnimatedGifArea}
Force thumbnailing of animated GIFs above this size to a single
frame instead of an animated thumbnail.  As of MW 1.17 this limit
is checked against the total size of all frames in the animation.


It probably makes sense to keep this equal to $wgMaxImageArea.

# TiffThumbnailType {#TiffThumbnailType}
Browsers don't support TIFF inline generally...
For inline display, we need to convert to PNG or JPEG.

Note scaling should work with ImageMagick, but may not with GD scaling.

**Example:**

```
// PNG is lossless, but inefficient for photos
$wgTiffThumbnailType = [ 'png', 'image/png' ];
// JPEG is good for photos, but has no transparency support. Bad for diagrams.
$wgTiffThumbnailType = [ 'jpg', 'image/jpeg' ];
```

# ThumbnailEpoch {#ThumbnailEpoch}
If rendered thumbnail files are older than this timestamp, they
will be rerendered on demand as if the file didn't already exist.

Update if there is some need to force thumbs and SVG rasterizations
to rerender, such as fixes to rendering bugs.

# AttemptFailureEpoch {#AttemptFailureEpoch}
Certain operations are avoided if there were too many recent failures,
for example, thumbnail generation. Bump this value to invalidate all
memory of failed operations and thus allow further attempts to resume.

This is useful when a cause for the failures has been found and fixed.

# IgnoreImageErrors {#IgnoreImageErrors}
If set, inline scaled images will still produce "<img>" tags ready for
output instead of showing an error message.

This may be useful if errors are transitory, especially if the site
is configured to automatically render thumbnails on request.

On the other hand, it may obscure error conditions from debugging.
Enable the debug log or the 'thumbnail' log group to make sure errors
are logged to a file for review.

# GenerateThumbnailOnParse {#GenerateThumbnailOnParse}
Render thumbnails while parsing wikitext.

If set to false, then the Parser will output valid thumbnail URLs without
generating or storing the thumbnail files. This can significantly speed up
processing on the web server. The site admin needs to configure a 404 handler
in order for the URLs in question to regenerate the thumbnails in question
on-demand. This can enable concurrency and also save computing resources
as not every resolution of every image on every page is accessed between
re-parses of the article. For example, re-parses triggered by bot edits,
or cascading updates from template edits.

If you use $wgLocalFileRepo, then you will also need to set the following:

```
$wgLocalFileRepo['transformVia404'] = true;
```
@since 1.7.0

# ShowArchiveThumbnails {#ShowArchiveThumbnails}
Show thumbnails for old images on the image description page

# EnableAutoRotation {#EnableAutoRotation}
If set to true, images that contain certain the exif orientation tag will
be rotated accordingly. If set to null, try to auto-detect whether a scaler
is available that can rotate.

# Antivirus {#Antivirus}
Internal name of virus scanner. This serves as a key to the
$wgAntivirusSetup array. Set this to NULL to disable virus scanning. If not
null, every file uploaded will be scanned for viruses.

# AntivirusSetup {#AntivirusSetup}
Configuration for different virus scanners. This an associative array of
associative arrays. It contains one setup array per known scanner type.

The entry is selected by $wgAntivirus, i.e.
valid values for $wgAntivirus are the keys defined in this array.

The configuration array for each scanner contains the following keys:
"command", "codemap", "messagepattern":

"command" is the full command to call the virus scanner - %f will be
replaced with the name of the file to scan. If not present, the filename
will be appended to the command. Note that this must be overwritten if the
scanner is not in the system path; in that case, please set
$wgAntivirusSetup[$wgAntivirus]['command'] to the desired command with full
path.

"codemap" is a mapping of exit code to return codes of the detectVirus
function in SpecialUpload.
  - An exit code mapped to AV_SCAN_FAILED causes the function to consider
    the scan to be failed. This will pass the file if $wgAntivirusRequired
    is not set.
  - An exit code mapped to AV_SCAN_ABORTED causes the function to consider
    the file to have an unsupported format, which is probably immune to
    viruses. This causes the file to pass.
  - An exit code mapped to AV_NO_VIRUS will cause the file to pass, meaning
    no virus was found.
  - All other codes (like AV_VIRUS_FOUND) will cause the function to report
    a virus.
  - You may use "*" as a key in the array to catch all exit codes not mapped otherwise.

"messagepattern" is a perl regular expression to extract the meaningful part of the scanners
output. The relevant part should be matched as group one (\1).
If not defined or the pattern does not match, the full message is shown to the user.

# AntivirusRequired {#AntivirusRequired}
Determines if a failed virus scan (AV_SCAN_FAILED) will cause the file to be rejected.

# VerifyMimeType {#VerifyMimeType}
Determines if the MIME type of uploaded files should be checked

# VerifyMimeTypeIE {#VerifyMimeTypeIE}
Determines whether extra checks for IE type detection should be applied.

This is a conservative check for exactly what IE 6 or so checked for,
and shouldn't trigger on for instance JPEG files containing links in EXIF
metadata.
@since 1.34

# MimeTypeFile {#MimeTypeFile}
Sets the MIME type definition file to use by includes/libs/mime/MimeAnalyzer.php.

When this is set to the path of a mime.types file, MediaWiki will use this
file to map MIME types to file extensions and vice versa, in lieu of its
internal MIME map. Note that some MIME mappings are considered "baked in"
and cannot be overridden. See includes/libs/mime/MimeMapMinimal.php for a
full list.
example: $wgMimeTypeFile = '/etc/mime.types';

# MimeInfoFile {#MimeInfoFile}
Sets the MIME type info file to use by includes/libs/mime/MimeAnalyzer.php.

Set to null to use the minimum set of built-in defaults only.

# MimeDetectorCommand {#MimeDetectorCommand}
Sets an external MIME detector program. The command must print only
the MIME type to standard output.

The name of the file to process will be appended to the command given here.
If not set or NULL, PHP's mime_content_type function will be used.

**Example:**

```
#$wgMimeDetectorCommand = "file -bi"; // use external MIME detector (Linux)
```

# TrivialMimeDetection {#TrivialMimeDetection}
Switch for trivial MIME detection. Used by thumb.php to disable all fancy
things, because only a few types of images are needed and file extensions
can be trusted.

# XMLMimeTypes {#XMLMimeTypes}
Additional XML types we can allow via MIME-detection.

array = [ 'rootElement' => 'associatedMimeType' ]

# ImageLimits {#ImageLimits}
Limit images on image description pages to a user-selectable limit.

In order to reduce disk usage, limits can only be selected from this list.
The user preference is saved as an array offset in the database, by default
the offset is set with $wgDefaultUserOptions['imagesize']. Make sure you
change it if you alter the array (see T10858).

This list is also used by ImagePage for alternate size links.

# ThumbLimits {#ThumbLimits}
Adjust thumbnails on image pages according to a user setting. In order to
reduce disk usage, the values can only be selected from a list. This is the
list of settings the user can choose from:

# ThumbnailBuckets {#ThumbnailBuckets}
When defined, is an array of image widths used as buckets for thumbnail generation.

The goal is to save resources by generating thumbnails based on reference buckets instead of
always using the original. This will incur a speed gain but cause a quality loss.

The buckets generation is chained, with each bucket generated based on the above bucket
when possible. File handlers have to opt into using that feature. For now only BitmapHandler
supports it.

# ThumbnailMinimumBucketDistance {#ThumbnailMinimumBucketDistance}
When using thumbnail buckets as defined above, this sets the minimum distance to the bucket
above the requested size. The distance represents how many extra pixels of width the bucket
needs in order to be used as the reference for a given thumbnail. For example, with the
following buckets:

$wgThumbnailBuckets = [ 128, 256, 512 ];

and a distance of 50:

$wgThumbnailMinimumBucketDistance = 50;

If we want to render a thumbnail of width 220px, the 512px bucket will be used,
because 220 + 50 = 270 and the closest bucket bigger than 270px is 512.

# UploadThumbnailRenderMap {#UploadThumbnailRenderMap}
When defined, is an array of thumbnail widths to be rendered at upload time. The idea is to
prerender common thumbnail sizes, in order to avoid the necessity to render them on demand, which
has a performance impact for the first client to view a certain size.

This obviously means that more disk space is needed per upload upfront.
@since 1.25

# UploadThumbnailRenderMethod {#UploadThumbnailRenderMethod}
The method through which the thumbnails will be prerendered for the entries in
$wgUploadThumbnailRenderMap

The method can be either "http" or "jobqueue". The former uses an http request to hit the
thumbnail's URL.
This method only works if thumbnails are configured to be rendered by a 404 handler. The latter
option uses the job queue to render the thumbnail.
@since 1.25

# UploadThumbnailRenderHttpCustomHost {#UploadThumbnailRenderHttpCustomHost}
When using the "http" $wgUploadThumbnailRenderMethod, lets one specify a custom Host HTTP header.
@since 1.25

# UploadThumbnailRenderHttpCustomDomain {#UploadThumbnailRenderHttpCustomDomain}
When using the "http" $wgUploadThumbnailRenderMethod, lets one specify a custom domain to send
the HTTP request to.
@since 1.25

# UseTinyRGBForJPGThumbnails {#UseTinyRGBForJPGThumbnails}
When this variable is true and JPGs use the sRGB ICC profile, swaps it for the more lightweight
(and free) TinyRGB profile when generating thumbnails.
@since 1.26

# GalleryOptions {#GalleryOptions}
Parameters for the "<gallery>" tag.

Fields are:
- imagesPerRow:   Default number of images per-row in the gallery. 0 -> Adapt to screensize
- imageWidth:     Width of the cells containing images in galleries (in "px")
- imageHeight:    Height of the cells containing images in galleries (in "px")
- captionLength:  Length to truncate filename to in caption when using "showfilename".
                  A value of 'true' will truncate the filename to one line using CSS
                  and will be the behaviour after deprecation.
@deprecated since 1.28
- showBytes:      Show the filesize in bytes in categories
- showDimensions: Show the dimensions (width x height) in categories
- mode:           Gallery mode

# ThumbUpright {#ThumbUpright}
Adjust width of upright images when parameter 'upright' is used
This allows a nicer look for upright images without the need to fix the width
by hardcoded px in wiki sourcecode.

# DirectoryMode {#DirectoryMode}
Default value for chmoding of new directories.

# ResponsiveImages {#ResponsiveImages}
Generate and use thumbnails suitable for screens with 1.5 and 2.0 pixel densities.

This means a 320x240 use of an image on the wiki will also generate 480x360 and 640x480
thumbnails, output via the srcset attribute.

# ImagePreconnect {#ImagePreconnect}
On pages containing images, tell the user agent to pre-connect to hosts from
$wgForeignFileRepos.  This speeds up rendering, but may create unwanted
traffic if there are many possible URLs from which images are served.
@since 1.35
@warning EXPERIMENTAL!

# DjvuDump {#DjvuDump}
Path of the djvudump executable
Enable this and $wgDjvuRenderer to enable djvu rendering
example: $wgDjvuDump = 'djvudump';

# DjvuRenderer {#DjvuRenderer}
Path of the ddjvu DJVU renderer
Enable this and $wgDjvuDump to enable djvu rendering
example: $wgDjvuRenderer = 'ddjvu';

# DjvuTxt {#DjvuTxt}
Path of the djvutxt DJVU text extraction utility
Enable this and $wgDjvuDump to enable text layer extraction from djvu files
example: $wgDjvuTxt = 'djvutxt';

# DjvuPostProcessor {#DjvuPostProcessor}
Shell command for the DJVU post processor
Default: pnmtojpeg, since ddjvu generates ppm output
Set this to false to output the ppm file directly.

# DjvuOutputExtension {#DjvuOutputExtension}
File extension for the DJVU post processor output

# EmergencyContact {#EmergencyContact}
Site admin email address.

Defaults to "wikiadmin@$wgServerName" (in Setup.php).

# PasswordSender {#PasswordSender}
Sender email address for e-mail notifications.

The address we use as sender when a user requests a password reminder,
as well as other e-mail notifications.

Defaults to "apache@$wgServerName" (in Setup.php).

# NoReplyAddress {#NoReplyAddress}
Reply-To address for e-mail notifications.

Defaults to $wgPasswordSender (in Setup.php).

# EnableEmail {#EnableEmail}
Set to true to enable the e-mail basic features:
Password reminders, etc. If sending e-mail on your
server doesn't work, you might want to disable this.

# EnableUserEmail {#EnableUserEmail}
Set to true to enable user-to-user e-mail.

This can potentially be abused, as it's hard to track.

# EnableSpecialMute {#EnableSpecialMute}
Set to true to enable the Special Mute page. This allows users
to mute unwanted communications from other users, and is linked
to from emails originating from Special:Email.
@since 1.34
@deprecated since 1.34

# EnableUserEmailMuteList {#EnableUserEmailMuteList}
Set to true to enable user-to-user e-mail mutelist.
@since 1.37; previously $wgEnableUserEmailBlacklist

# UserEmailUseReplyTo {#UserEmailUseReplyTo}
If true put the sending user's email in a Reply-To header
instead of From (false). ($wgPasswordSender will be used as From.)

Some mailers (eg SMTP) set the SMTP envelope sender to the From value,
which can cause problems with SPF validation and leak recipient addresses
when bounces are sent to the sender. In addition, DMARC restrictions
can cause emails to fail to be received when false.

# PasswordReminderResendTime {#PasswordReminderResendTime}
Minimum time, in hours, which must elapse between password reminder
emails for a given account. This is to prevent abuse by mail flooding.

# NewPasswordExpiry {#NewPasswordExpiry}
The time, in seconds, when an emailed temporary password expires.

# UserEmailConfirmationTokenExpiry {#UserEmailConfirmationTokenExpiry}
The time, in seconds, when an email confirmation email expires

# PasswordExpirationDays {#PasswordExpirationDays}
The number of days that a user's password is good for. After this number of days, the
user will be asked to reset their password. Set to false to disable password expiration.

# PasswordExpireGrace {#PasswordExpireGrace}
If a user's password is expired, the number of seconds when they can still login,
and cancel their password change, but are sent to the password change form on each login.

# SMTP {#SMTP}
SMTP Mode.

For using a direct (authenticated) SMTP server connection.
Default to false or fill an array :

```
$wgSMTP = [
    'host'     => 'SMTP domain',
    'IDHost'   => 'domain for MessageID',
    'port'     => '25',
    'auth'     => [true|false],
    'username' => [SMTP username],
    'password' => [SMTP password],
];
```

# AdditionalMailParams {#AdditionalMailParams}
Additional email parameters, will be passed as the last argument to mail() call.

# AllowHTMLEmail {#AllowHTMLEmail}
For parts of the system that have been updated to provide HTML email content, send
both text and HTML parts as the body of the email

# EnotifFromEditor {#EnotifFromEditor}
Allow sending of e-mail notifications with the editor's address as sender.

This setting depends on $wgEnotifRevealEditorAddress also being enabled.
If both are enabled, notifications for actions from users that have opted-in,
will be sent to other users with their address as "From" instead of "Reply-To".

If disabled, or not opted-in, notifications come from $wgPasswordSender.

# EmailAuthentication {#EmailAuthentication}
Require email authentication before sending mail to an email address.

This is highly recommended. It prevents MediaWiki from being used as an open
spam relay.

# EnotifWatchlist {#EnotifWatchlist}
Allow users to enable email notification ("enotif") on watchlist changes.

# EnotifUserTalk {#EnotifUserTalk}
Allow users to enable email notification ("enotif") when someone edits their
user talk page.

The owner of the user talk page must also have the 'enotifusertalkpages' user
preference set to true.

# EnotifRevealEditorAddress {#EnotifRevealEditorAddress}
Allow sending of e-mail notifications with the editor's address in "Reply-To".

Note, enabling this only actually uses it in notification e-mails if the user
opted-in to this feature. This feature flag also controls visibility of the
'enotifrevealaddr' preference, which, if users opt into, will make e-mail
notifications about their actions use their address as "Reply-To".

To set the address as "From" instead of "Reply-To", also enable $wgEnotifFromEditor.

If disabled, or not opted-in, notifications come from $wgPasswordSender.

# EnotifMinorEdits {#EnotifMinorEdits}
Potentially send notification mails on minor edits to pages. This is enabled
by default.  If this is false, users will never be notified on minor edits.

If it is true, editors with the 'nominornewtalk' right (typically bots) will still not
trigger notifications for minor edits they make (to any page, not just user talk).

Finally, if the watcher/recipient has the 'enotifminoredits' user preference set to
false, they will not receive notifications for minor edits.

User talk notifications are also affected by $wgEnotifMinorEdits, the above settings,
$wgEnotifUserTalk, and the preference described there.

# EnotifImpersonal {#EnotifImpersonal}
Send a generic mail instead of a personalised mail for each user.  This
always uses UTC as the time zone, and doesn't include the username.

For pages with many users watching, this can significantly reduce mail load.
Has no effect when using sendmail rather than SMTP.

# EnotifMaxRecips {#EnotifMaxRecips}
Maximum number of users to mail at once when using impersonal mail. Should
match the limit on your mail server.

# EnotifUseRealName {#EnotifUseRealName}
Use real name instead of username in e-mail "from" field.

# UsersNotifiedOnAllChanges {#UsersNotifiedOnAllChanges}
Array of usernames who will be sent a notification email for every change
which occurs on a wiki. Users will not be notified of their own changes.

# DBname {#DBname}
Current wiki database name

Should be alphanumeric, without spaces nor hyphens.
This is used to determine the current/local wiki ID (WikiMap::getCurrentWikiDbDomain).

This should still be set even if $wgLBFactoryConf is configured.

# DBmwschema {#DBmwschema}
Current wiki database schema name

Should be alphanumeric, without spaces nor hyphens.
This is used to determine the current/local wiki ID (WikiMap::getCurrentWikiDbDomain).

This should still be set even if $wgLBFactoryConf is configured.

# DBprefix {#DBprefix}
Current wiki database table name prefix

Should be alphanumeric, without spaces nor hyphens, preferably ending in an underscore.
This is used to determine the current/local wiki ID (WikiMap::getCurrentWikiDbDomain).

This should still be set even if $wgLBFactoryConf is configured.

# DBserver {#DBserver}
Database host name or IP address

# DBport {#DBport}
Database port number (for PostgreSQL and Microsoft SQL Server).

# DBuser {#DBuser}
Database username

# DBpassword {#DBpassword}
Database user's password

# DBtype {#DBtype}
Database type

# DBssl {#DBssl}
Whether to use SSL in DB connection.

This setting is only used if $wgLBFactoryConf['class'] is set to
'\Wikimedia\Rdbms\LBFactorySimple' and $wgDBservers is an empty array; otherwise
the DBO_SSL flag must be set in the 'flags' option of the database
connection to achieve the same functionality.

# DBcompress {#DBcompress}
Whether to use compression in DB connection.

This setting is only used $wgLBFactoryConf['class'] is set to
'\Wikimedia\Rdbms\LBFactorySimple' and $wgDBservers is an empty array; otherwise
the DBO_COMPRESS flag must be set in the 'flags' option of the database
connection to achieve the same functionality.

# DBadminuser {#DBadminuser}
Separate username for maintenance tasks. Leave as null to use the default.

# DBadminpassword {#DBadminpassword}
Separate password for maintenance tasks. Leave as null to use the default.

# SearchType {#SearchType}
Search type.

Leave as null to select the default search engine for the
selected database type (eg SearchMySQL), or set to a class
name to override to a custom search engine.

If the canonical name for the search engine doesn't match the class name
(because it's namespaced for example), you can add a mapping for this in
SearchMappings in extension.json.

# SearchTypeAlternatives {#SearchTypeAlternatives}
Alternative search types

Sometimes you want to support multiple search engines for testing. This
allows users to select their search engine of choice via url parameters
to Special:Search and the action=search API. If using this, there's no
need to add $wgSearchType to it, that is handled automatically.

If the canonical name for the search engine doesn't match the class name
(because it's namespaced for example), you can add a mapping for this in
SearchMappings in extension.json.

# DBTableOptions {#DBTableOptions}
MySQL table options to use during installation or update

# SQLMode {#SQLMode}
SQL Mode - default is turning off all modes, including strict, if set.

null can be used to skip the setting for performance reasons and assume
DBA has done his best job.
String override can be used for some additional fun :-)

# DBDefaultGroup {#DBDefaultGroup}
Default group to use when getting database connections.

Will be used as default query group in ILoadBalancer::getConnection.
@since 1.32

# SQLiteDataDir {#SQLiteDataDir}
To override default SQLite data directory ($docroot/../data)

# SharedDB {#SharedDB}
Shared database for multiple wikis. Commonly used for storing a user table
for single sign-on. The server for this database must be the same as for the
main database.

For backwards compatibility the shared prefix is set to the same as the local
prefix, and the user table is listed in the default list of shared tables.
The user_properties table is also added so that users will continue to have their
preferences shared (preferences were stored in the user table prior to 1.16)

$wgSharedTables may be customized with a list of tables to share in the shared
database. However it is advised to limit what tables you do share as many of
MediaWiki's tables may have side effects if you try to share them.

$wgSharedPrefix is the table prefix for the shared database. It defaults to
$wgDBprefix.

$wgSharedSchema is the table schema for the shared database. It defaults to
$wgDBmwschema.
@deprecated since 1.21 In new code, use the $wiki parameter to LBFactory::getMainLB() to
access remote databases. Using LBFactory::getMainLB() allows the shared database to
reside on separate servers to the wiki's own database, with suitable
configuration of $wgLBFactoryConf.

# SharedPrefix {#SharedPrefix}

@see $wgSharedDB

# SharedTables {#SharedTables}

@see $wgSharedDB
The installer will add 'actor' to this list for all new wikis.

# SharedSchema {#SharedSchema}

@see $wgSharedDB
@since 1.23

# DBservers {#DBservers}
Database load balancer
This is a two-dimensional array, a list of server info structures
Fields are:
  - host:        Host name
  - dbname:      Default database name
  - user:        DB user
  - password:    DB password
  - type:        DB type
  - driver:      DB driver (when there are multiple drivers)

  - load:        Ratio of DB_REPLICA load, must be >=0, the sum of all loads must be >0.
                 If this is zero for any given server, no normal query traffic will be
                 sent to it. It will be excluded from lag checks in maintenance scripts.
                 The only way it can receive traffic is if groupLoads is used.

  - groupLoads:  (optional) Array of load ratios, the key is the query group name. A query
                 may belong to several groups, the most specific group defined here is used.

  - flags:       (optional) Bit field of properties:
                 - DBO_DEFAULT:    Transactionalize web requests and use autocommit otherwise
                 - DBO_DEBUG:      Equivalent of $wgDebugDumpSql
                 - DBO_SSL:        Use TLS connection encryption if available
                 - DBO_COMPRESS:   Use protocol compression with database connections
                 - DBO_PERSISTENT: Enables persistent database connections

  - max lag:     (optional) Maximum replication lag before a replica DB goes out of rotation
  - is static:   (optional) Set to true if the dataset is static and no replication is used.
  - cliMode:     (optional) Connection handles will not assume that requests are short-lived
                 nor that INSERT..SELECT can be rewritten into a buffered SELECT and INSERT.
                 This is what DBO_DEFAULT uses to determine when a web request is present.
                 [Default: uses value of $wgCommandLineMode]

  These and any other user-defined properties will be assigned to the mLBInfo member
  variable of the Database object.

Leave at false to use the single-server variables above. If you set this
variable, the single-server variables will generally be ignored (except
perhaps in some command-line scripts).

The first server listed in this array (with key 0) will be the primary. The
rest of the servers will be replica DBs. To prevent writes to your replica DBs due to
accidental misconfiguration or MediaWiki bugs, set read_only=1 on all your
replica DBs in my.cnf. You can set read_only mode at runtime using:

```
SET @@read_only=1;
```

Since the effect of writing to a replica DB is so damaging and difficult to clean
up, we at Wikimedia set read_only=1 in my.cnf on all our DB servers, even
our primaries, and then set read_only=0 on primaries at runtime.

# LBFactoryConf {#LBFactoryConf}
Load balancer factory configuration
To set up a multi-primary wiki farm, set the class here to something that
can return a LoadBalancer with an appropriate primary on a call to getMainLB().

The class identified here is responsible for reading $wgDBservers,
$wgDBserver, etc., so overriding it may cause those globals to be ignored.

The LBFactoryMulti class is provided for this purpose, please see
includes/db/LBFactoryMulti.php for configuration information.

# DataCenterUpdateStickTTL {#DataCenterUpdateStickTTL}
After a state-changing request is done by a client, this determines
how many seconds that client should keep using the primary datacenter.

This avoids unexpected stale or 404 responses due to replication lag.

This must be greater than or equal to
Wikimedia\Rdbms\ChronologyProtector::POSITION_COOKIE_TTL.
@since 1.27

# DBerrorLog {#DBerrorLog}
File to log database errors to

# DBerrorLogTZ {#DBerrorLogTZ}
Timezone to use in the error log.

Defaults to the wiki timezone ($wgLocaltimezone).

A list of usable timezones can found at:
https://www.php.net/manual/en/timezones.php

**Examples:**

```
$wgDBerrorLogTZ = 'UTC';
$wgDBerrorLogTZ = 'GMT';
$wgDBerrorLogTZ = 'PST8PDT';
$wgDBerrorLogTZ = 'Europe/Sweden';
$wgDBerrorLogTZ = 'CET';
```
@since 1.20

# LocalDatabases {#LocalDatabases}
Other wikis on this site, can be administered from a single developer account.

# DatabaseReplicaLagWarning {#DatabaseReplicaLagWarning}
If lag is higher than $wgDatabaseReplicaLagWarning, show a warning in some special
pages (like watchlist). If the lag is higher than $wgDatabaseReplicaLagCritical,
show a more obvious warning.
@since 1.36

# DatabaseReplicaLagCritical {#DatabaseReplicaLagCritical}
@see $wgDatabaseReplicaLagWarning
@since 1.36

# MaxExecutionTimeForExpensiveQueries {#MaxExecutionTimeForExpensiveQueries}
Max execution time for queries of several expensive special pages such as RecentChanges
in milliseconds.

@since 1.38

# MultiContentRevisionSchemaMigrationStage {#MultiContentRevisionSchemaMigrationStage}
RevisionStore table schema migration stage (content, slots, content_models & slot_roles tables).

Use the SCHEMA_COMPAT_XXX flags. Supported values:

- SCHEMA_COMPAT_OLD
- SCHEMA_COMPAT_WRITE_BOTH | SCHEMA_COMPAT_READ_OLD
- SCHEMA_COMPAT_WRITE_BOTH | SCHEMA_COMPAT_READ_NEW
- SCHEMA_COMPAT_OLD

Note that reading the old and new schema at the same time is not supported.
Attempting to set both read bits in $wgMultiContentRevisionSchemaMigrationStage
will result in an InvalidArgumentException.
@see Task: https://phabricator.wikimedia.org/T174028
@see Commit: https://gerrit.wikimedia.org/r/#/c/378724/
@since 1.32
@deprecated Since 1.35, the only accepted value is SCHEMA_COMPAT_NEW.
No longer functions as a setting. Will be removed in 1.36.

# ActorTableSchemaMigrationStage {#ActorTableSchemaMigrationStage}
Actor table schema migration stage, for migration from the temporary table
revision_actor_temp to the revision.rev_actor field.

Use the SCHEMA_COMPAT_XXX flags. Supported values:

  - SCHEMA_COMPAT_TEMP
  - SCHEMA_COMPAT_WRITE_TEMP_AND_NEW | SCHEMA_COMPAT_READ_TEMP
  - SCHEMA_COMPAT_WRITE_TEMP_AND_NEW | SCHEMA_COMPAT_READ_NEW
  - SCHEMA_COMPAT_NEW

History:
  - 1.31: Added
  - 1.32: Now uses SCHEMA_COMPAT_XXX flags
  - 1.34: Removed, implicitly SCHEMA_COMPAT_NEW always
  - 1.37: Re-added with SCHEMA_COMPAT_NEW renamed to SCHEMA_COMPAT_TEMP for
    a new migration which removes temporary tables.

# TemplateLinksSchemaMigrationStage {#TemplateLinksSchemaMigrationStage}
Templatelinks table schema migration stage, for normalizing tl_namespace and tl_title fields.

Use the SCHEMA_COMPAT_XXX flags. Supported values:

  - SCHEMA_COMPAT_OLD
  - SCHEMA_COMPAT_WRITE_BOTH | SCHEMA_COMPAT_READ_OLD
  - SCHEMA_COMPAT_WRITE_BOTH | SCHEMA_COMPAT_READ_NEW
  - SCHEMA_COMPAT_NEW

History:
  - 1.38: Added

# ContentHandlers {#ContentHandlers}
Plugins for page content model handling.

Each entry in the array maps a model id to a class name or callback
that creates an instance of the appropriate ContentHandler subclass.
@since 1.21

# NamespaceContentModels {#NamespaceContentModels}
Associative array mapping namespace IDs to the name of the content model pages in that namespace
should have by default (use the CONTENT_MODEL_XXX constants). If no special content type is
defined for a given namespace, pages in that namespace will use the CONTENT_MODEL_WIKITEXT
(except for the special case of JS and CS pages).
@note To determine the default model for a new page's main slot, or any slot in general,
use SlotRoleHandler::getDefaultModel() together with SlotRoleRegistry::getRoleHandler().
@since 1.21

# ContentHandlerTextFallback {#ContentHandlerTextFallback}
How to react if a plain text version of a non-text Content object is requested using
ContentHandler::getContentText():

* 'ignore': return null
* 'fail': throw an MWException
* 'serialize': serialize to default format
@since 1.21
@deprecated since 1.37

# TextModelsToParse {#TextModelsToParse}
Determines which types of text are parsed as wikitext. This does not imply that these kinds
of texts are also rendered as wikitext, it only means that links, magic words, etc will have
the effect on the database they would have on a wikitext page.
@todo On the long run, it would be nice to put categories etc into a separate structure,
or at least parse only the contents of comments in the scripts.
@since 1.21

# CompressRevisions {#CompressRevisions}
We can also compress text stored in the 'text' table. If this is set on, new
revisions will be compressed on page save if zlib support is available. Any
compressed revisions will be decompressed on load regardless of this setting,
but will not be readable at all if zlib support is not available.

# ExternalStores {#ExternalStores}
List of enabled ExternalStore protocols.

@see ExternalStoreAccess

```
$wgExternalStores = [ "DB" ];
```

# ExternalServers {#ExternalServers}
Shortcut for setting `$wgLBFactoryConf["externalClusters"]`.

This is only applicable when using the default LBFactory
of {@link Wikimedia::Rdbms::LBFactorySimple LBFactorySimple}.
It is ignored if a different LBFactory is set, or if `externalClusters`
is already set explicitly.

@see ExternalStoreAccess

**Example:**
Create a cluster named 'blobs_cluster1':

```
$wgExternalServers = [
    'blobs_cluster1' => <array in the same format as $wgDBservers>
];
```

# DefaultExternalStore {#DefaultExternalStore}
The place to put new text blobs or false to put them in the text table
of the local wiki database.

@see ExternalStoreAccess

**Example:**

```
$wgDefaultExternalStore = [ 'DB://cluster1', 'DB://cluster2' ];
```

# RevisionCacheExpiry {#RevisionCacheExpiry}
Revision text may be cached in the main WAN cache to reduce load on external
storage servers and object extraction overhead for frequently-loaded revisions.

Set to 0 to disable, or number of seconds before cache expiry.

# PageLanguageUseDB {#PageLanguageUseDB}
Enable page language feature
Allows setting page language in database
@since 1.24

# DiffEngine {#DiffEngine}
Specify the difference engine to use.

Supported values:
- 'external': Use an external diff engine, which must be specified via $wgExternalDiffEngine
- 'wikidiff2': Use the wikidiff2 PHP extension
- 'php': PHP implementations included in MediaWiki

The default (null) is to use the first engine that's available.
@since 1.35

# ExternalDiffEngine {#ExternalDiffEngine}
Name of the external diff engine to use.

# RequestTimeLimit {#RequestTimeLimit}
Set a limit on server request wall clock time.

If the Excimer extension is enabled, setting this will cause an exception
to be thrown after the specified number of seconds. If the extension is
not available, set_time_limit() will be called instead.
@since 1.36

# TransactionalTimeLimit {#TransactionalTimeLimit}
The request time limit for "slow" write requests that should not be
interrupted due to the risk of data corruption.

The limit will only be raised. If the pre-existing time limit is larger,
then this will have no effect.
@since 1.26

# CriticalSectionTimeLimit {#CriticalSectionTimeLimit}
The maximum time critical sections are allowed to stay open. Critical
sections are used to defer Excimer request timeouts. If Excimer is available
and this time limit is exceeded, an exception will be thrown at the next
opportunity, typically after a long-running function like a DB query returns.

Critical sections may wrap long-running queries, and it's generally better
for the timeout to be handled a few milliseconds later when the critical
section exits, so this should be a large number.

This limit is ignored in command-line mode.
@since 1.36

# MiserMode {#MiserMode}
Disable database-intensive features

# DisableQueryPages {#DisableQueryPages}
Disable all query pages if miser mode is on, not just some

# QueryCacheLimit {#QueryCacheLimit}
Number of rows to cache in 'querycache' table when miser mode is on

# WantedPagesThreshold {#WantedPagesThreshold}
Number of links to a page required before it is deemed "wanted"

# AllowSlowParserFunctions {#AllowSlowParserFunctions}
Enable slow parser functions

# AllowSchemaUpdates {#AllowSchemaUpdates}
Allow schema updates

# MaxArticleSize {#MaxArticleSize}
Maximum article size in kibibytes

# MemoryLimit {#MemoryLimit}
The minimum amount of memory that MediaWiki "needs"; MediaWiki will try to
raise PHP's memory limit if it's below this amount.

# PoolCounterConf {#PoolCounterConf}
Configuration for processing pool control, for use in high-traffic wikis.

An implementation is provided in the PoolCounter extension.

This configuration array maps pool types to an associative array. The only
defined key in the associative array is "class", which gives the class name.
The remaining elements are passed through to the class as constructor
parameters.

**Example using local redis instance:**

```
$wgPoolCounterConf = [ 'ArticleView' => [
  'class' => PoolCounterRedis::class,
  'timeout' => 15, // wait timeout in seconds
  'workers' => 1, // maximum number of active threads in each pool
  'maxqueue' => 5, // maximum number of total threads in each pool
  'servers' => [ '127.0.0.1' ],
  'redisConfig' => []
] ];
```

**Example using C daemon from https://www.mediawiki.org/wiki/Extension:PoolCounter:**

```
$wgPoolCounterConf = [ 'ArticleView' => [
  'class' => MediaWiki\Extension\PoolCounter\Client::class,
  'timeout' => 15, // wait timeout in seconds
  'workers' => 5, // maximum number of active threads in each pool
  'maxqueue' => 50, // maximum number of total threads in each pool
  ... any extension-specific options...
] ];
```

# MaxUserDBWriteDuration {#MaxUserDBWriteDuration}
Max time (in seconds) a user-generated transaction can spend in writes.

If exceeded, the transaction is rolled back with an error instead of being committed.
@since 1.27

# MaxJobDBWriteDuration {#MaxJobDBWriteDuration}
Max time (in seconds) a job-generated transaction can spend in writes.

If exceeded, the transaction is rolled back with an error instead of being committed.
@since 1.30

# LinkHolderBatchSize {#LinkHolderBatchSize}
LinkHolderArray batch size
For debugging

# MaximumMovedPages {#MaximumMovedPages}
Maximum number of pages to move at once when moving subpages with a page.

# ForceDeferredUpdatesPreSend {#ForceDeferredUpdatesPreSend}
Force deferred updates to be run before sending a response to the client,
instead of attempting to run them after sending the response. Setting this
to true is useful for end-to-end testing, to ensure that the effects of a
request are visible to any subsequent requests, even if they are made
immediately after the first one. Note however that this does not ensure
that database replication is complete, nor does it execute any jobs
enqueued for later.
There should be no reason to set this in a normal production environment.
@since 1.38

# CacheDirectory {#CacheDirectory}
Directory for caching data in the local filesystem. Should not be accessible
from the web.

Note: if multiple wikis share the same localisation cache directory, they
must all have the same set of extensions. You can set a directory just for
the localisation cache using $wgLocalisationCacheConf['storeDirectory'].

# MainCacheType {#MainCacheType}
Main cache type. This should be a cache with fast access, but it may have
limited space. By default, it is disabled, since the stock database cache
is not fast enough to make it worthwhile.

The options are:

- CACHE_ANYTHING:   Use anything, as long as it works
- CACHE_NONE:       Do not cache
- CACHE_DB:         Store cache objects in the DB
- CACHE_MEMCACHED:  MemCached, must specify servers in $wgMemCachedServers
- CACHE_ACCEL:      APC, APCU or WinCache
- (other):          A string may be used which identifies a cache
                    configuration in $wgObjectCaches.
@see $wgMessageCacheType, $wgParserCacheType

# MessageCacheType {#MessageCacheType}
The cache type for storing the contents of the MediaWiki namespace. This
cache is used for a small amount of data which is expensive to regenerate.

For available types see $wgMainCacheType.

# ParserCacheType {#ParserCacheType}
The cache type for storing article HTML. This is used to store data which
is expensive to regenerate, and benefits from having plenty of storage space.

For available types see $wgMainCacheType.

# SessionCacheType {#SessionCacheType}
The cache backend for storing session data.

Used by MediaWiki\Session\SessionManager. See $wgMainCacheType for available types.

See [SessionManager Storage expectations](@ref SessionManager-storage-expectations).

# LanguageConverterCacheType {#LanguageConverterCacheType}
The cache type for storing language conversion tables,
which are used when parsing certain text and interface messages.

For available types see $wgMainCacheType.
@since 1.20

# ObjectCaches {#ObjectCaches}
Advanced object cache configuration.

Use this to define the class names and constructor parameters which are used
for the various cache types. Custom cache types may be defined here and
referenced from $wgMainCacheType, $wgMessageCacheType, $wgParserCacheType,
or $wgLanguageConverterCacheType.

The format is an associative array where the key is a cache identifier, and
the value is an associative array of parameters. The "class" parameter is the
class name which will be used. Alternatively, a "factory" parameter may be
given, giving a callable function which will generate a suitable cache object.

# MainWANCache {#MainWANCache}
Main Wide-Area-Network cache type.

By default, this will wrap $wgMainCacheType (which is disabled, since the basic
stock default of CACHE_DB is not fast enough to make it worthwhile).

For single server or single datacenter setup, setting $wgMainCacheType
is enough.

For a multiple datacenter setup, WANObjectCache should be configured to
broadcast some if its operations using Mcrouter or Dynomite.
See @ref wanobjectcache-deployment "Deploying WANObjectCache".

The options are:
  - false:            Configure the cache using $wgMainCacheType, without using
                      a relayer (only matters if there are multiple datacenters)
  - CACHE_NONE:       Do not cache
  - (other):          A string may be used which identifies a cache
                      configuration in $wgWANObjectCaches
@since 1.26

# WANObjectCaches {#WANObjectCaches}
Advanced WAN object cache configuration.

The format is an associative array where the key is an identifier
that may be referenced by $wgMainWANCache, and the value is an array of options:

 - class:   (Required) The class to use (must be WANObjectCache or a subclass).
 - cacheId: (Required) A cache identifier from $wgObjectCaches.
 - secret:  (Optional) Stable secret for hashing long strings in key components.
            Default: $wgSecretKey.

Any other options are treated as constructor parameters to WANObjectCache,
except for 'cache', 'logger', 'stats' and 'asyncHandler' which are
unconditionally set by MediaWiki core's ServiceWiring.

**Example:**

```
$wgWANObjectCaches['memcached-php'] => [
  'class' => WANObjectCache::class,
  'cacheId' => 'memcached-php',
];
```
@since 1.26

# EnableWANCacheReaper {#EnableWANCacheReaper}
Verify and enforce WAN cache purges using reliable DB sources as streams.

These secondary cache purges are de-duplicated via simple cache mutexes.
This improves consistency when cache purges are lost, which becomes more likely
as more cache servers are added or if there are multiple datacenters. Only keys
related to important mutable content will be checked.
@since 1.29

# MainStash {#MainStash}
The object store type of the main stash.

This should be a fast storage system optimized for lightweight data, both ephemeral and
permanent, for things like counters, tokens, and blobs. The dataset access scope should
include all the application servers in all datacenters. Thus, the data must be replicated
among all datacenters. The store should have "Last Write Wins" eventual consistency. Per
https://en.wikipedia.org/wiki/PACELC_theorem, the store should act as a PA/EL distributed
system for these operations.

The multi-datacenter strategy for MediaWiki is to have CDN route HTTP POST requests to the
primary datacenter and HTTP GET/HEAD/OPTIONS requests to the closest datacenter to the client.
The stash accepts write operations from any datacenter, but cross-datacenter replication is
asynchronous.

Modules that use the main stash can expect race conditions to occur if a key can receive
write operations originating from multiple datacenters. To improve consistency, callers
should avoid main stash updates during non-POST requests. In any case, callers should
gracefully tolerate occasional key evictions, temporary inconsistencies among datacenters,
and violations of linearizability (e.g. during timeouts). Modules that can never handle these
kind of anamolies should use other storage mediums.

Valid options are the keys of {@link $wgObjectCaches}, e.g. CACHE_* constants.
@see \BagOStuff
@since 1.26

# ChronologyProtectorStash {#ChronologyProtectorStash}
The object store type for the {@link Wikimedia::Rdbms::ChronologyProtector ChronologyProtector} store.

This should be a fast storage system optimized for lightweight ephemeral data.
Data stored should be readable by all application servers in the local datacenter.

See [ChronologyProtector requirements](@ref ChronologyProtector-storage-requirements)
for more detailed system administrator requirements (especially for multi-dc operations).

Valid options are the keys of {@link $wgObjectCaches}, e.g. CACHE_* constants.
Defaults to {@link $wgMainCacheType} (in ServiceWiring.php).
@since 1.36

# ParserCacheExpireTime {#ParserCacheExpireTime}
The expiry time for the parser cache, in seconds.

The default is 86400 (one day).

# OldRevisionParserCacheExpireTime {#OldRevisionParserCacheExpireTime}
The expiry time for the parser cache for old revisions, in seconds.

The default is 3600 (cache disabled).

# ObjectCacheSessionExpiry {#ObjectCacheSessionExpiry}
The expiry time to use for session storage, in seconds.

# PHPSessionHandling {#PHPSessionHandling}
Whether to use PHP session handling ($_SESSION and session_*() functions)

If the constant MW_NO_SESSION is defined, this is forced to 'disable'.

If the constant MW_NO_SESSION_HANDLER is defined, this is ignored and PHP
session handling will function independently of SessionHandler.
SessionHandler and PHP's session handling may attempt to override each
others' cookies.
@since 1.27

# SuspiciousIpExpiry {#SuspiciousIpExpiry}
Time in seconds to remember IPs for, for the purposes of logging IP changes within the
same session. This is meant more for debugging errors in the authentication system than
for detecting abuse.
@since 1.36

# SessionPbkdf2Iterations {#SessionPbkdf2Iterations}
Number of internal PBKDF2 iterations to use when deriving session secrets.
@since 1.28

# MemCachedServers {#MemCachedServers}
The list of MemCached servers and port numbers

# MemCachedPersistent {#MemCachedPersistent}
Use persistent connections to MemCached, which are shared across multiple
requests.

# MemCachedTimeout {#MemCachedTimeout}
Read/write timeout for MemCached server communication, in microseconds.

# UseLocalMessageCache {#UseLocalMessageCache}
Set this to true to maintain a copy of the message cache on the local server.

This layer of message cache is in addition to the one configured by $wgMessageCacheType.

The local copy is put in APC. If APC is not installed, this setting does nothing.

Note that this is about the message cache, which stores interface messages
maintained as wiki pages. This is separate from the localisation cache for interface
messages provided by the software, which is configured by $wgLocalisationCacheConf.

# AdaptiveMessageCache {#AdaptiveMessageCache}
Instead of caching everything, only cache those messages which have
been customised in the site content language. This means that
MediaWiki:Foo/ja is ignored if MediaWiki:Foo doesn't exist.

This option is probably only useful for translatewiki.net.

# LocalisationCacheConf {#LocalisationCacheConf}
Localisation cache configuration.

Used by Language::getLocalisationCache() to decide how to construct the
LocalisationCache instance. Associative array with keys:

class:       The class to use for constructing the LocalisationCache object.
             This may be overridden by extensions to a subclass of LocalisationCache.
             Sub classes are expected to still honor the 'storeClass', 'storeDirectory'
             and 'manualRecache' options where applicable.

storeClass:  Which LCStore class implementation to use. This is optional.
             The default LocalisationCache class offers the 'store' option
             as abstraction for this.

store:       How and where to store localisation cache data.
             This option is ignored if 'storeClass' is explicitly set to a class name.
             Must be one of:
             - 'detect' (default): Automatically select 'files' if 'storeDirectory'
                or $wgCacheDirectory is set, and fall back to 'db' otherwise.
             - 'files': Store in $wgCacheDirectory as CDB files.
             - 'array': Store in $wgCacheDirectory as PHP static array files.
             - 'db': Store in the l10n_cache database table.

storeDirectory: If the selected LCStore class puts its data in files, then it
                will use this directory. If set to false (default), then
                $wgCacheDirectory is used instead.

manualRecache: Set this to true to disable cache updates on web requests.
               Use maintenance/rebuildLocalisationCache.php instead.

# CachePages {#CachePages}
Allow client-side caching of pages

# CacheEpoch {#CacheEpoch}
Set this to current time to invalidate all prior cached pages. Affects both
client-side and server-side caching.

You can get the current date on your server by using the command:
@verbatim date +%Y%m%d%H%M%S
@endverbatim

# GitInfoCacheDirectory {#GitInfoCacheDirectory}
Directory where GitInfo will look for pre-computed cache files. If false,
$wgCacheDirectory/gitinfo will be used.

# UseFileCache {#UseFileCache}
This will cache static pages for non-logged-in users to reduce
database traffic on public sites. ResourceLoader requests to default
language and skins are cached as well as single module requests.

# FileCacheDepth {#FileCacheDepth}
Depth of the subdirectory hierarchy to be created under
$wgFileCacheDirectory.  The subdirectories will be named based on
the MD5 hash of the title.  A value of 0 means all cache files will
be put directly into the main file cache directory.

# RenderHashAppend {#RenderHashAppend}
Append a configured value to the parser cache and the sitenotice key so
that they can be kept separate for some class of activity.

# EnableSidebarCache {#EnableSidebarCache}
If on, the sidebar navigation links are cached for users with the
current language set. This can save a touch of load on a busy site
by shaving off extra message lookups.

However it is also fragile: changing the site configuration, or
having a variable $wgArticlePath, can produce broken links that
don't update as expected.

# SidebarCacheExpiry {#SidebarCacheExpiry}
Expiry time for the sidebar cache, in seconds

# FooterLinkCacheExpiry {#FooterLinkCacheExpiry}
Expiry time for the footer link cache, in seconds, or 0 if disabled
@since 1.35

# UseGzip {#UseGzip}
When using the file cache, we can store the cached HTML gzipped to save disk
space. Pages will then also be served compressed to clients that support it.

Requires zlib support enabled in PHP.

# InvalidateCacheOnLocalSettingsChange {#InvalidateCacheOnLocalSettingsChange}
Invalidate various caches when LocalSettings.php changes. This is equivalent
to setting $wgCacheEpoch to the modification time of LocalSettings.php, as
was previously done in the default LocalSettings.php file.

On high-traffic wikis, this should be set to false, to avoid the need to
check the file modification time, and to avoid the performance impact of
unnecessary cache invalidations.

# ExtensionInfoMTime {#ExtensionInfoMTime}
When loading extensions through the extension registration system, this
can be used to invalidate the cache. A good idea would be to set this to
one file, you can just `touch` that one to invalidate the cache

**Example:**

```
$wgExtensionInfoMTime = filemtime( "$IP/LocalSettings.php" );
```

If set to false, the mtime for each individual JSON file will be checked,
which can be slow if a large number of extensions are being loaded.

# ParserCacheUseJson {#ParserCacheUseJson}
Enable JSON serialization for ParserCache.

In 1.36 the default serialization format for ParserCache has been changed from PHP serialization
to JSON serialization. The cache is still compatible with old PHP-serialized entries, so for the
most part the change should be unnoticed. However in case some extensions are installed which write
non-JSON-serializable data to ParserOutput::setExtensionData, the cache will break for some pages.
Setting this to 'false' makes ParserCache use PHP serialization format for writing new cache entries,
and all the cache entries already written in JSON are discarded.
@since 1.36
@deprecated since 1.36
@see https://phabricator.wikimedia.org/T263579

# EnableRemoteBagOStuffTests {#EnableRemoteBagOStuffTests}
If this is set to true, phpunit will run integration tests against remote
caches defined in $wgObjectCaches.

@since 1.38

# UseCdn {#UseCdn}
Enable/disable CDN.

See https://www.mediawiki.org/wiki/Manual:Performance_tuning#Page_view_caching
@since 1.34 Renamed from $wgUseSquid.

# VaryOnXFP {#VaryOnXFP}
Add X-Forwarded-Proto to the Vary and Key headers for API requests and
RSS/Atom feeds. Use this if you have an SSL termination setup
and need to split the cache between HTTP and HTTPS for API requests,
feed requests and HTTP redirect responses in order to prevent cache
pollution. This does not affect 'normal' requests to index.php other than
HTTP redirects.

# InternalServer {#InternalServer}
Internal server name as known to CDN, if different.

**Example:**

```
$wgInternalServer = 'http://yourinternal.tld:8000';
```

# CdnMaxAge {#CdnMaxAge}
Cache TTL for the CDN sent as s-maxage (without ESI) or
Surrogate-Control (with ESI). Without ESI, you should strip
out s-maxage in the CDN config.

18000 seconds = 5 hours, more cache hits with 2678400 = 31 days.
@since 1.34 Renamed from $wgSquidMaxage

# CdnMaxageLagged {#CdnMaxageLagged}
Cache timeout for the CDN when DB replica DB lag is high
@see $wgCdnMaxAge
@since 1.27

# CdnMaxageStale {#CdnMaxageStale}
Cache timeout when delivering a stale ParserCache response due to PoolCounter
contention.
@since 1.35

# CdnReboundPurgeDelay {#CdnReboundPurgeDelay}
If set, any SquidPurge call on a URL or URLs will send a second purge no less than
this many seconds later via the job queue. This requires delayed job support.

This should be safely higher than the 'max lag' value in $wgLBFactoryConf, so that
replica DB lag does not cause page to be stuck in stales states in CDN.

This also fixes race conditions in two-tiered CDN setups (e.g. cdn2 => cdn1 => MediaWiki).
If a purge for a URL reaches cdn2 before cdn1 and a request reaches cdn2 for that URL,
it will populate the response from the stale cdn1 value. When cdn1 gets the purge, cdn2
will still be stale. If the rebound purge delay is safely higher than the time to relay
a purge to all nodes, then the rebound purge will clear cdn2 after cdn1 was cleared.
@since 1.27

# CdnMaxageSubstitute {#CdnMaxageSubstitute}
Cache timeout for the CDN when a response is known to be wrong or incomplete (due to load)
@see $wgCdnMaxAge
@since 1.27

# ForcedRawSMaxage {#ForcedRawSMaxage}
Default maximum age for raw CSS/JS accesses

300 seconds = 5 minutes.

# CdnServers {#CdnServers}
List of proxy servers to purge on changes; default port is 80. Use IP addresses.

When MediaWiki is running behind a proxy, it will trust X-Forwarded-For
headers sent/modified from these proxies when obtaining the remote IP address

For a list of trusted servers which *aren't* purged, see $wgSquidServersNoPurge.
@since 1.34 Renamed from $wgSquidServers.

# CdnServersNoPurge {#CdnServersNoPurge}
As with $wgCdnServers, except these servers aren't purged on page changes;
use to set a list of trusted proxies, etc. Supports both individual IP
addresses and CIDR blocks.
@since 1.23 Supports CIDR ranges
@since 1.34 Renamed from $wgSquidServersNoPurge

# SquidPurgeUseHostHeader {#SquidPurgeUseHostHeader}
Whether to use a Host header in purge requests sent to the proxy servers
configured in $wgCdnServers. Set this to false to support a CDN
configured in forward-proxy mode.

If this is set to true, a Host header will be sent, and only the path
component of the URL will appear on the request line, as if the request
were a non-proxy HTTP 1.1 request. Varnish only supports this style of
request. Squid supports this style of request only if reverse-proxy mode
(http_port ... accel) is enabled.

If this is set to false, no Host header will be sent, and the absolute URL
will be sent in the request line, as is the standard for an HTTP proxy
request in both HTTP 1.0 and 1.1. This style of request is not supported
by Varnish, but is supported by Squid in either configuration (forward or
reverse).
@since 1.21
@deprecated since 1.33, will always be true in a future release.

# HTCPRouting {#HTCPRouting}
Routing configuration for HTCP multicast purging. Add elements here to
enable HTCP and determine which purges are sent where. If set to an empty
array, HTCP is disabled.

Each key in this array is a regular expression to match against the purged
URL, or an empty string to match all URLs. The purged URL is matched against
the regexes in the order specified, and the first rule whose regex matches
is used, all remaining rules will thus be ignored.

**Example configuration to send purges for upload.wikimedia.org to one**
multicast group and all other purges to another:

```
$wgHTCPRouting = [
        '|^https?://upload\.wikimedia\.org|' => [
                'host' => '239.128.0.113',
                'port' => 4827,
        ],
        '' => [
                'host' => '239.128.0.112',
                'port' => 4827,
        ],
];
```

You can also pass an array of hosts to send purges too. This is useful when
you have several multicast groups or unicast address that should receive a
given purge.  Multiple hosts support was introduced in MediaWiki 1.22.

**Example of sending purges to multiple hosts:**

```
$wgHTCPRouting = [
    '' => [
        // Purges to text caches using multicast
        [ 'host' => '239.128.0.114', 'port' => '4827' ],
        // Purges to a hardcoded list of caches
        [ 'host' => '10.88.66.1', 'port' => '4827' ],
        [ 'host' => '10.88.66.2', 'port' => '4827' ],
        [ 'host' => '10.88.66.3', 'port' => '4827' ],
    ],
];
```
@since 1.22
@see $wgHTCPMulticastTTL

# HTCPMulticastTTL {#HTCPMulticastTTL}
HTCP multicast TTL.
@see $wgHTCPRouting

# UsePrivateIPs {#UsePrivateIPs}
Should forwarded Private IPs be accepted?

# LanguageCode {#LanguageCode}
Site language code. See languages/data/Names.php for languages supported by
MediaWiki out of the box. Not all languages listed there have translations,
see languages/messages/ for the list of languages with some localisation.

Warning: Don't use any of MediaWiki's deprecated language codes listed in
LanguageCode::getDeprecatedCodeMapping or $wgDummyLanguageCodes, like "no"
for Norwegian (use "nb" instead). If you do, things will break unexpectedly.

This defines the default interface language for all users, but users can
change it in their preferences.

This also defines the language of pages in the wiki. The content is wrapped
in a html element with lang=XX attribute. This behavior can be overridden
via hooks, see Title::getPageLanguage.

# GrammarForms {#GrammarForms}
Some languages need different word forms, usually for different cases.

Used in Language::convertGrammar().

**Example:**

```
$wgGrammarForms['en']['genitive']['car'] = 'car\'s';
```

# InterwikiMagic {#InterwikiMagic}
Treat language links as magic connectors, not inline links

# HideInterlanguageLinks {#HideInterlanguageLinks}
Hide interlanguage links from the sidebar

# ExtraInterlanguageLinkPrefixes {#ExtraInterlanguageLinkPrefixes}
List of additional interwiki prefixes that should be treated as
interlanguage links (i.e. placed in the sidebar).

Notes:
- This will not do anything unless the prefixes are defined in the interwiki
  map.
- The display text for these custom interlanguage links will be fetched from
  the system message "interlanguage-link-xyz" where xyz is the prefix in
  this array.
- A friendly name for each site, used for tooltip text, may optionally be
  placed in the system message "interlanguage-link-sitename-xyz" where xyz is
  the prefix in this array.

# InterlanguageLinkCodeMap {#InterlanguageLinkCodeMap}
Map of interlanguage link codes to language codes. This is useful to override
what is shown as the language name when the interwiki code does not match it
exactly
@since 1.35

# ExtraLanguageNames {#ExtraLanguageNames}
List of language names or overrides for default names in Names.php

# ExtraLanguageCodes {#ExtraLanguageCodes}
List of mappings from one language code to another.

This array makes the codes not appear as a selectable language on the
installer.

In Setup.php, the variable $wgDummyLanguageCodes is created by combining
these codes with a list of "deprecated" codes, which are mostly leftovers
from renames or other legacy things, and the internal codes 'qqq' and 'qqx'.
If a mapping in $wgExtraLanguageCodes collide with a built-in mapping, the
value in $wgExtraLanguageCodes will be used.
@since 1.29

# DummyLanguageCodes {#DummyLanguageCodes}
Functionally the same as $wgExtraLanguageCodes, but deprecated. Instead of
appending values to this array, append them to $wgExtraLanguageCodes.
@deprecated since 1.29

# AllUnicodeFixes {#AllUnicodeFixes}
Set this to always convert certain Unicode sequences to modern ones
regardless of the content language. This has a small performance
impact.
@since 1.17

# LegacyEncoding {#LegacyEncoding}
Set this to eg 'ISO-8859-1' to perform character set conversion when
loading old revisions not marked with "utf-8" flag. Use this when
converting a wiki from MediaWiki 1.4 or earlier to UTF-8 without the
burdensome mass conversion of old text data.
@note This DOES NOT touch any fields other than old_text. Titles, comments,
user names, etc still must be converted en masse in the database before
continuing as a UTF-8 wiki.

# LegacySchemaConversion {#LegacySchemaConversion}
If set to true, the MediaWiki 1.4 to 1.5 schema conversion will
create stub reference rows in the text table instead of copying
the full text of all current entries from 'cur' to 'text'.

This will speed up the conversion step for large sites, but
requires that the cur table be kept around for those revisions
to remain viewable.

This option affects the updaters *only*. Any present cur stub
revisions will be readable at runtime regardless of this setting.

# AmericanDates {#AmericanDates}
Enable dates like 'May 12' instead of '12 May', if the default date format
is 'dmy or mdy'.

# TranslateNumerals {#TranslateNumerals}
For Hindi and Arabic use local numerals instead of Western style (0-9)
numerals in interface.

# UseDatabaseMessages {#UseDatabaseMessages}
Translation using MediaWiki: namespace.

Interface messages will be loaded from the database.

# MaxMsgCacheEntrySize {#MaxMsgCacheEntrySize}
Maximum entry size in the message cache, in bytes

# DisableLangConversion {#DisableLangConversion}
Whether to enable language variant conversion.

# DisableTitleConversion {#DisableTitleConversion}
Whether to enable language variant conversion for links.

# DefaultLanguageVariant {#DefaultLanguageVariant}
Default variant code, if false, the default will be the language code

# UsePigLatinVariant {#UsePigLatinVariant}
Whether to enable the pig Latin variant of English (en-x-piglatin),
used to ease variant development work.

# DisabledVariants {#DisabledVariants}
Disabled variants array of language variant conversion.

**Example:**

```
$wgDisabledVariants[] = 'zh-mo';
$wgDisabledVariants[] = 'zh-my';
```

# VariantArticlePath {#VariantArticlePath}
Like $wgArticlePath, but on multi-variant wikis, this provides a
path format that describes which parts of the URL contain the
language variant.

**Example:**

```
$wgLanguageCode = 'sr';
$wgVariantArticlePath = '/$2/$1';
$wgArticlePath = '/wiki/$1';
```

A link to /wiki/ would be redirected to /sr/Главна_страна

It is important that $wgArticlePath not overlap with possible values
of $wgVariantArticlePath.

# LoginLanguageSelector {#LoginLanguageSelector}
Show a bar of language selection links in the user login and user
registration forms; edit the "loginlanguagelinks" message to
customise these.

# ForceUIMsgAsContentMsg {#ForceUIMsgAsContentMsg}
When translating messages with wfMessage(), it is not always clear what
should be considered UI messages and what should be content messages.

For example, for the English Wikipedia, there should be only one 'mainpage',
so when getting the link for 'mainpage', we should treat it as site content
and call ->inContentLanguage()->text(), but for rendering the text of the
link, we call ->text(). The code behaves this way by default. However,
sites like the Wikimedia Commons do offer different versions of 'mainpage'
and the like for different languages. This array provides a way to override
the default behavior.

**Example:**
To allow language-specific main page and community
portal:

```
$wgForceUIMsgAsContentMsg = [ 'mainpage', 'portal-url' ];
```

# RawHtmlMessages {#RawHtmlMessages}
List of messages which might contain raw HTML.

Extensions should add their insecure raw HTML messages to extension.json.
The list is used for access control:
changing messages listed here will require editsitecss and editsitejs rights.

Message names must be given with underscores rather than spaces and with lowercase first letter.
@since 1.32

# Localtimezone {#Localtimezone}
Fake out the timezone that the server thinks it's in. This will be used for
date display and not for what's stored in the DB. Leave to null to retain
your server's OS-based timezone value.

This variable is currently used only for signature formatting and for local
time/date parser variables ({{LOCALTIME}} etc.)

Timezones can be translated by editing MediaWiki messages of type
timezone-nameinlowercase like timezone-utc.

A list of usable timezones can found at:
https://www.php.net/manual/en/timezones.php

**Examples:**

```
$wgLocaltimezone = 'UTC';
$wgLocaltimezone = 'GMT';
$wgLocaltimezone = 'PST8PDT';
$wgLocaltimezone = 'Europe/Sweden';
$wgLocaltimezone = 'CET';
```

# LocalTZoffset {#LocalTZoffset}
Set an offset from UTC in minutes to use for the default timezone setting
for anonymous users and new user accounts.

This setting is used for most date/time displays in the software, and is
overridable in user preferences. It is *not* used for signature timestamps.

By default, this will be set to match $wgLocaltimezone.

# OverrideUcfirstCharacters {#OverrideUcfirstCharacters}
Map of Unicode characters for which capitalization is overridden in
Language::ucfirst. The characters should be
represented as char_to_convert => conversion_override. See T219279 for details
on why this is useful during php version transitions.
@warning: EXPERIMENTAL!
@since 1.34

# MimeType {#MimeType}
The default Content-Type header.

# Html5Version {#Html5Version}
Defines the value of the version attribute in the &lt;html&gt; tag, if any.

If your wiki uses RDFa, set it to the correct value for RDFa+HTML5.
Correct current values are 'HTML+RDFa 1.0' or 'XHTML+RDFa 1.0'.
See also https://www.w3.org/TR/rdfa-in-html/#document-conformance
@since 1.16

# HTMLFormAllowTableFormat {#HTMLFormAllowTableFormat}
Temporary variable that allows HTMLForms to be rendered as tables.

Table based layouts cause various issues when designing for mobile.
This global allows skins or extensions a means to force non-table based rendering.
Setting to false forces form components to always render as div elements.
@since 1.24

# UseMediaWikiUIEverywhere {#UseMediaWikiUIEverywhere}
Temporary variable that applies MediaWiki UI wherever it can be supported.

Temporary variable that should be removed when mediawiki ui is more
stable and change has been communicated.
@since 1.24

# EditSubmitButtonLabelPublish {#EditSubmitButtonLabelPublish}
Whether to label the store-to-database-and-show-to-others button in the editor
as "Save page"/"Save changes" if false (the default) or, if true, instead as
"Publish page"/"Publish changes".
@since 1.28

# XhtmlNamespaces {#XhtmlNamespaces}
Permit other namespaces in addition to the w3.org default.

Use the prefix for the key and the namespace for the value.

**Example:**

```
$wgXhtmlNamespaces['svg'] = 'http://www.w3.org/2000/svg';
```

Normally we wouldn't have to define this in the root "<html>"
element, but IE needs it there in some circumstances.

This is ignored if $wgMimeType is set to a non-XML MIME type.

# SiteNotice {#SiteNotice}
Site notice shown at the top of each page

MediaWiki:Sitenotice page, which will override this. You can also
provide a separate message for logged-out users using the
MediaWiki:Anonnotice page.

# BrowserFormatDetection {#BrowserFormatDetection}
Override ability of certains browsers to attempt to autodetect dataformats in pages.

This is a default feature of many mobile browsers, but can have a lot of false positives,
where for instance year ranges are confused with phone numbers.
The default of this setting is to disable telephone number data detection.
Set BrowserFormatDetection to false to fallback to browser defaults.
@since 1.37
@see https://developer.apple.com/ library/archive/documentation/AppleApplications/Reference/SafariHTMLRef/Articles/MetaTags.html

# SkinMetaTags {#SkinMetaTags}
An array of open graph tags which should be added by all skins.

Accepted values are "og:title", "og:type" and "twitter:card".
Since some of these fields can be provided by extensions it defaults to an empty array.
@since 1.36

# DefaultSkin {#DefaultSkin}
Default skin, for new users and anonymous visitors. Registered users may
change this to any one of the other available skins in their preferences.

# FallbackSkin {#FallbackSkin}
Fallback skin used when the skin defined by $wgDefaultSkin can't be found.
@since 1.24

# SkipSkins {#SkipSkins}
Specify the names of skins that should not be presented in the list of
available skins in user preferences.

NOTE: This does not uninstall the skin, and it will still be accessible
via the `useskin` query parameter. To uninstall a skin, remove its inclusion
from LocalSettings.php.
@see \SkinFactory::getAllowedSkins

# DisableOutputCompression {#DisableOutputCompression}
Disable output compression (enabled by default if zlib is available)

# FragmentMode {#FragmentMode}
How should section IDs be encoded?
This array can contain 1 or 2 elements, each of them can be one of:
- 'html5'  is modern HTML5 style encoding with minimal escaping. Displays Unicode
           characters in most browsers' address bars.

- 'legacy' is old MediaWiki-style encoding, e.g. 啤酒 turns into .E5.95.A4.E9.85.92

The first element of this array specifies the primary mode of escaping IDs. This
is what users will see when they e.g. follow an [[#internal link]] to a section of
a page.

The optional second element defines a fallback mode, useful for migrations.
If present, it will direct MediaWiki to add empty <span>s to every section with its
id attribute set to fallback encoded title so that links using the previous encoding
would still work.

Example: you want to migrate your wiki from 'legacy' to 'html5'

On the first step, set this variable to [ 'legacy', 'html5' ]. After a while, when
all caches (parser, HTTP, etc.) contain only pages generated with this setting,
flip the value to [ 'html5', 'legacy' ]. This will result in all internal links being
generated in the new encoding while old links (both external and cached internal) will
still work. After a long time, you might want to ditch backwards compatibility and
set it to [ 'html5' ]. After all, pages get edited, breaking incoming links no matter which
fragment mode is used.
@since 1.30

# ExternalInterwikiFragmentMode {#ExternalInterwikiFragmentMode}
Which ID escaping mode should be used for external interwiki links? See documentation
for $wgFragmentMode above for details of each mode. Because you can't control external sites,
this setting should probably always be 'legacy', unless every wiki you link to has converted
to 'html5'.
@since 1.30

# FooterIcons {#FooterIcons}
Abstract list of footer icons for skins in place of old copyrightico and poweredbyico code
You can add new icons to the built in copyright or poweredby, or you can create
a new block. Though note that you may need to add some custom css to get good styling
of new blocks in monobook. vector and modern should work without any special css.

$wgFooterIcons itself is a key/value array.
The key is the name of a block that the icons will be wrapped in. The final id varies
by skin; Monobook and Vector will turn poweredby into f-poweredbyico while Modern
turns it into mw_poweredby.
The value is either key/value array of icons or a string.
In the key/value array the key may or may not be used by the skin but it can
be used to find the icon and unset it or change the icon if needed.
This is useful for disabling icons that are set by extensions.
The value should be either a string or an array. If it is a string it will be output
directly as html, however some skins may choose to ignore it. An array is the preferred format
for the icon, the following keys are used:
- src: An absolute url to the image to use for the icon, this is recommended
       but not required, however some skins will ignore icons without an image
- srcset: optional additional-resolution images; see HTML5 specs
- url: The url to use in the a element around the text or icon, if not set an a element will
       not be outputted
- alt: This is the text form of the icon, it will be displayed without an image in
       skins like Modern or if src is not set, and will otherwise be used as
       the alt="" for the image. This key is required.
- width and height: If the icon specified by src is not of the standard size
                    you can specify the size of image to use with these keys.
                    Otherwise they will default to the standard 88x31.
@todo Reformat documentation.

# UseCombinedLoginLink {#UseCombinedLoginLink}
Login / create account link behavior when it's possible for anonymous users
to create an account.

- true = use a combined login / create account link
- false = split login and create account into two separate links

# Edititis {#Edititis}
Display user edit counts in various prominent places.

# Send404Code {#Send404Code}
Some web hosts attempt to rewrite all responses with a 404 (not found)
status code, mangling or hiding MediaWiki's output. If you are using such a
host, you should start looking for a better one. While you're doing that,
set this to false to convert some of MediaWiki's 404 responses to 200 so
that the generated error pages can be seen.

In cases where for technical reasons it is more important for MediaWiki to
send the correct status code than for the body to be transmitted intact,
this configuration variable is ignored.

# ShowRollbackEditCount {#ShowRollbackEditCount}
The $wgShowRollbackEditCount variable is used to show how many edits can be rolled back.

The numeric value of the variable controls how many edits MediaWiki will look back to
determine whether a rollback is allowed (by checking that they are all from the same author).
If the value is false or 0, the edits are not counted. Disabling this will prevent MediaWiki
from hiding some useless rollback links.
@since 1.20

# EnableCanonicalServerLink {#EnableCanonicalServerLink}
Output a <link rel="canonical"> tag on every page indicating the canonical
server which should be used, i.e. $wgServer or $wgCanonicalServer. Since
detection of the current server is unreliable, the link is sent
unconditionally.

# MangleFlashPolicy {#MangleFlashPolicy}
When OutputHandler is used, mangle any output that contains
<cross-domain-policy>. Without this, an attacker can send their own
cross-domain policy unless it is prevented by the crossdomain.xml file at
the domain root.
@since 1.25

# ResourceModules {#ResourceModules}
Define extra client-side modules to be registered with ResourceLoader.
@note It is recommended to define modules using the `ResourceModule` attribute
in `extension.json` or `skin.json` when possible (instead of via PHP global variables).

Registration is internally handled by ResourceLoader::register.

## Available modules

Modules that ship with %MediaWiki core are registered via
resources/Resources.php. For a full list with documentation, see:
[ResourceLoader/Core_modules](https://www.mediawiki.org/wiki/ResourceLoader/Core_modules).

## Options

- class `{string}`:
  By default a module is assumed to bundle file resources
  as handled by the ResourceLoaderFileModule class. Use this option
  to use a different implementation of ResourceLoaderModule instead.

  Default: `ResourceLoaderFileModule`

- factory `{string}`:
  Override the instantiation of the ResourceLoaderModule class using
  a PHP callback. This allows dependency injection to be used.
  This option cannot be combined with the `class` option.

  Since: MW 1.30

- dependencies `{string[]|string}`:
  Modules that must be executed before this module.
  Module name string or list of module name strings.

  Default: `[]`

- deprecated `{boolean|string}`:
  Whether the module is deprecated and usage is discouraged.
  Set to boolean true, or a string to include in the warning message.

  Default: `false`

- group `{string}`:
  Optional request group to override which modules may be downloaded
  together in an HTTP batch request. By default, any two modules may be
  loaded together in the same batch request. Set this option to a
  descriptive string to give the module its own HTTP request. To allow
  other modules to join this new request, give those the same request group.

  Use this option with caution. The default behaviour is well-tuned already,
  and setting this often does more harm than good. For more about request
  balancing optimisations, see
  [ResourceLoader/Architecture#Balance](https://www.mediawiki.org/wiki/ResourceLoader/Architecture#Balance).

- skipFunction `{string}`:
  Allow this module to be satisfied as dependency without actually loading
  or executing scripts from the server, if the specified JavaScript function
  returns true.

  Use this to provide polyfills that are natively available in newer browsers.
  Specify the relative path to a JavaScript file containing a top-level return
  statement. The contents of the file should not contain any wrapping function,
  it will be wrapped by %ResourceLoader in an anonymous function and invoked
  when the module is considered for loading.

- targets `{string[]}`
  List of %ResourceLoader targets where the module may be loaded from.
  This is used by the MobileFrontend extension to prevent certain modules
  from being loaded.

  This option is **deprecated**. See [T127268](https://phabricator.wikimedia.org/T127268).

  Default: `["desktop"]`

## FileModule options

- localBasePath `{string}`:
  Base file path to prepend to relative file paths specified in other options.

  Default: `$IP`

- remoteBasePath `{string}`:
  Base URL path to prepend to relative file paths specified in other options.
  This is used to form URLs for files, such as when referencing images in
  stylesheets, or in debug mode to serve JavaScript files directly.

  Default: @ref $wgResourceBasePath (which defaults to @ref $wgScriptPath)

- remoteExtPath `{string}`:
  Shortcut for `remoteBasePath` that is relative to $wgExtensionAssetsPath.
  Use this when defining modules from an extension, so as to avoid hardcoding
  the script path of the %MediaWiki install or the location of the extensions
  directory.

  This option is mutually exclusive with `remoteBasePath`.

- styles `{string[]|string|array<string,array>}`:
  Styles to always include in the module.
  %File path or list of file paths, relative to `localBasePath`.
  The stylesheet can be automatically wrapped in a `@media` query by specifying
  the file path as the key in an object (instead of the value), with the value
  specifying a `media` query.

  See @ref wgResourceModules-example-stylesheet "Stylesheet examples" below.

  See also @ref $wgResourceModuleSkinStyles.

  Extended options:

  - skinStyles `{string[]|string}`: Styles to include in specific skin contexts.
    Array keyed is by skin name with file path or list of file paths as value,
    relative to `localBasePath`.

  Default: `[]`

- noflip `{boolean}`:
  By default, CSSJanus will be used automatically to perform LTR-to-RTL flipping
  when loaded in a right-to-left (RTL) interface language context.
  Use this option to skip CSSJanus LTR-to-RTL flipping for this module, for example
  when registering an external library that already handles RTL styles.

  Default: `false`

- packageFiles `{string[]|array[]}`
  Specify script files and (virtual) data files to include in the module.
  Each internal JavaScript file retains its own local module scope and its
  private exports can be accessed separately by other client-side code in the
  same module, via the local `require()` function.

  Modules that use package files should export any public API methods using
  `module.exports`.

  See examples at [ResourceLoader/Package_files](https://www.mediawiki.org/wiki/ResourceLoader/Package_files)
  on mediawiki.org.

  The `packageFiles` feature cannot be combined with legacy scripts that use
  the `scripts` option, including its extended variants `languageScripts`,
  `skinScripts`, and `debugScripts`.

  Since: MW 1.33

  Default: `[]`

- scripts `{string[]|string}`:
  Scripts to always include in the module.
  %File path or list of file paths, relative to `localBasePath`.

  These files are concatenated blindly and executed as a single client-side script.
  Modules using this option are sometimes referred to as "legacy scripts" to
  distinguish them from those that use the `packageFiles` option.

  Modules that use legacy scripts usually attach any public APIs they have
  to the `mw` global variable. If a module contains just one file, it is also
  supported to use the newer `module.exports` mechanism, though if the module
  contains more than one legacy script, it is considered unsafe and unsupported
  to use this mechanism (use `packageFiles` instead). See also
  [Coding conventions/JavaScript](https://www.mediawiki.org/wiki/Manual:Coding_conventions/JavaScript#Exporting).

  Default: `[]`

  Extended options, concatenated in this order:

  - languageScripts `{string[]|string}`: Scripts to include in specific language contexts.
    Array is keyed by language code with file path or list of file path.
  - skinScripts `{string[]|string}`: Scripts to include in specific skin contexts.
    Array keyed is by skin name with file path or list of file paths.
  - debugScripts `{string[]|string}`: Scripts to include in debug contexts.
    %File path or list of file paths.

- messages `{string[]}`
  Localisation messages to bundle with this module, for client-side use
  via `mw.msg()` and `mw.message()`. List of message keys.

  Default: `[]`

- templates `{string[]}`
  List of template files to be loaded for client-side usage via `mw.templates`.

  Default: `[]`

- es6 `{boolean}`:
  If true, this module will only be executed in browsers that support ES6. You should set this
  flag for modules that use ES6 in their JavaScript. Only use this for modules that provide
  progressive enhancements that are safe to not load in browsers that are not modern but still
  have a substantial user base, like IE11.

  Since: MW 1.36

  Default: `false`

## Examples

**Example: Using an alternate subclass**

```
$wgResourceModules['ext.myExtension'] = [
  'class' => ResourceLoaderWikiModule::class,
];
```

**Example: Deprecated module**

```
$wgResourceModules['ext.myExtension'] = [
  'deprecated' => 'You should use ext.myExtension2 instead',
];
```

**Example: Base paths in extension.json**

```
"ext.myExtension": {
  "localBasePath": "modules/ext.MyExtension",
  "remoteExtPath": "MyExtension/modules/ext.MyExtension"
}
```

**Example: Base paths in core with PHP**

```
$wgResourceModules['mediawiki.example'] = [
  'localBasePath' => "$IP/resources/src/mediawiki.example",
  'remoteBasePath' => "$wgResourceBasePath/resources/src/mediawiki.example",
];
```

**Example: Define a skip function**

```
$wgResourceModules['ext.myExtension.SomeWebAPI'] = [
  'skipFunction' => 'skip-SomeWebAPI.js',
];
```

**Example: Contents of skip function file**

```
return typeof SomeWebAPI === 'function' && SomeWebAPI.prototype.duckMethod;
```

**Example: Module targets**

```
$wgResourceModules['ext.myExtension'] = [
  'targets' => [ 'desktop', 'mobile' ],
];
```
@anchor wgResourceModules-example-stylesheet

**Example: Stylesheets**

```
$wgResourceModules['example'] = [
  'styles' => [
    'foo.css',
    'bar.css',
  ],
];
$wgResourceModules['example.media'] = [
  'styles' => [
    'foo.css' => [ 'media' => 'print' ],
];
$wgResourceModules['example.mixed'] = [
  'styles' => [
    'foo.css',
    'bar.css' => [ 'media' => 'print' ],
  ],
];
```

**Example: Package files**

```
"ext.myExtension": {
    "localBasePath": "modules/ext.MyExtension",
    "remoteExtPath": "MyExtension/modules/ext.MyExtension",
    "packageFiles": [
      "index.js",
      "utils.js",
      "data.json"
    ]
  }
}
```

**Example: Legacy scripts**

```
$wgResourceModules['ext.myExtension'] = [
  'scripts' => [
    'modules/ext.myExtension/utils.js',
    'modules/ext.myExtension/myExtension.js',
  ],
  'languageScripts' => [
    'bs' => 'modules/ext.myExtension/languages/bs.js',
    'fi' => 'modules/ext.myExtension/languages/fi.js',
  ],
  'skinScripts' => [
    'default' => 'modules/ext.myExtension/skin-default.js',
  ],
  'debugScripts' => [
    'modules/ext.myExtension/debug.js',
  ],
];
```

**Example: Template files**

```
$wgResourceModules['ext.myExtension'] = [
  'templates' => [
    'templates/template.html',
    'templates/template2.html',
  ],
];
```
@since 1.17

# ResourceModuleSkinStyles {#ResourceModuleSkinStyles}
Add extra skin-specific styles to a resource module.

These are automatically added by ResourceLoader to the 'skinStyles' list of
the existing module. The 'styles' list cannot be modified or disabled.

For example, below a module "bar" is defined and skin Foo provides additional
styles for it:

**Example:**

```
$wgResourceModules['bar'] = [
  'scripts' => 'resources/bar/bar.js',
  'styles' => 'resources/bar/main.css',
];

$wgResourceModuleSkinStyles['foo'] = [
  'bar' => 'skins/Foo/bar.css',
];
```

This is effectively equivalent to:

**Equivalent:**

```
$wgResourceModules['bar'] = [
  'scripts' => 'resources/bar/bar.js',
  'styles' => 'resources/bar/main.css',
  'skinStyles' => [
    'foo' => skins/Foo/bar.css',
  ],
];
```

If the module already defines its own entry in `skinStyles` for a given skin, then
$wgResourceModuleSkinStyles is ignored.

If a module defines a `skinStyles['default']` the skin may want to extend that instead
of replacing it. This can be done using the `+` prefix.

**Example:**

```
$wgResourceModules['bar'] = [
  'scripts' => 'resources/bar/bar.js',
  'styles' => 'resources/bar/basic.css',
  'skinStyles' => [
   'default' => 'resources/bar/additional.css',
  ],
];
// Note the '+' character:
$wgResourceModuleSkinStyles['foo'] = [
  '+bar' => 'skins/Foo/bar.css',
];
```

This is effectively equivalent to:

**Equivalent:**

```
$wgResourceModules['bar'] = [
  'scripts' => 'resources/bar/bar.js',
  'styles' => 'resources/bar/basic.css',
  'skinStyles' => [
    'default' => 'resources/bar/additional.css',
    'foo' => [
      'resources/bar/additional.css',
      'skins/Foo/bar.css',
    ],
  ],
];
```

In other words, as a module author, use the `styles` list for stylesheets that may not be
disabled by a skin. To provide default styles that may be extended or replaced,
use `skinStyles['default']`.

As with $wgResourceModules, always set the localBasePath and remoteBasePath
keys (or one of remoteExtPath/remoteSkinPath).

**Example:**

```
$wgResourceModuleSkinStyles['foo'] = [
  'bar' => 'bar.css',
  'quux' => 'quux.css',
  'remoteSkinPath' => 'Foo',
  'localBasePath' => __DIR__,
];
```

# ResourceLoaderSources {#ResourceLoaderSources}
Extensions should register foreign module sources here. 'local' is a
built-in source that is not in this array, but defined by
ResourceLoader::__construct() so that it cannot be unset.

**Example:**

```
$wgResourceLoaderSources['foo'] = 'http://example.org/w/load.php';
```

# ResourceBasePath {#ResourceBasePath}
The default 'remoteBasePath' value for instances of ResourceLoaderFileModule.

Defaults to $wgScriptPath.

# ResourceLoaderMaxage {#ResourceLoaderMaxage}
How long a CDN or browser may cache a ResourceLoader HTTP response.

Maximum time in seconds. Used for the `max-age` and `s-maxage` Cache-Control headers.

Valid keys:
  - versioned: Used for URLs carrying a "version" parameter.
    This applies to the bulk of load.php transfers, and may have a long cache
    duration (e.g. weeks or months), because a change in the module bundle will
    naturally produce a different URL and thus automatically bust the cache.
  - unversioned: Used for URLs that must not carry a "version" parameter.
    This includes the startup manifest and controls how quickly changes (in
    the module registry, dependency tree, and module version) will propagate
    to clients. This should have a short cache duration (e.g. minutes).

@since 1.35

# ResourceLoaderUseObjectCacheForDeps {#ResourceLoaderUseObjectCacheForDeps}
Use the main stash instead of the module_deps table for indirect dependency tracking
@since 1.35
@warning EXPERIMENTAL

# ResourceLoaderDebug {#ResourceLoaderDebug}
The default debug mode (on/off) for of ResourceLoader requests.

This will still be overridden when the debug URL parameter is used.

# IncludeLegacyJavaScript {#IncludeLegacyJavaScript}
Whether to ensure the mediawiki.legacy library is loaded before other modules.
@deprecated since 1.26: Always declare dependencies.

# ResourceLoaderMaxQueryLength {#ResourceLoaderMaxQueryLength}
ResourceLoader will not generate URLs whose query string is more than
this many characters long, and will instead use multiple requests with
shorter query strings. Using multiple requests may degrade performance,
but may be needed based on the query string limit supported by your web
server and/or your user's web browsers.

Default: `2000`.
@see \ResourceLoaderStartUpModule::getMaxQueryLength
@since 1.17

# ResourceLoaderValidateJS {#ResourceLoaderValidateJS}
If set to true, JavaScript modules loaded from wiki pages will be parsed
prior to minification to validate it.

Parse errors will result in a JS exception being thrown during module load,
which avoids breaking other modules loaded in the same request.

# ResourceLoaderEnableJSProfiler {#ResourceLoaderEnableJSProfiler}
When enabled, execution of JavaScript modules is profiled client-side.

Instrumentation happens in mw.loader.profiler.
Use `mw.inspect('time')` from the browser console to display the data.
@since 1.32

# ResourceLoaderStorageEnabled {#ResourceLoaderStorageEnabled}
Whether ResourceLoader should attempt to persist modules in localStorage on
browsers that support the Web Storage API.

# ResourceLoaderStorageVersion {#ResourceLoaderStorageVersion}
Cache version for client-side ResourceLoader module storage. You can trigger
invalidation of the contents of the module store by incrementing this value.
@since 1.23

# AllowSiteCSSOnRestrictedPages {#AllowSiteCSSOnRestrictedPages}
Whether to allow site-wide CSS (MediaWiki:Common.css and friends) on
restricted pages like Special:UserLogin or Special:Preferences where
JavaScript is disabled for security reasons. As it is possible to
execute JavaScript through CSS, setting this to true opens up a
potential security hole. Some sites may "skin" their wiki by using
site-wide CSS, causing restricted pages to look unstyled and different
from the rest of the site.
@since 1.25

# VueDevelopmentMode {#VueDevelopmentMode}
Whether to use the development version of Vue.js. This should be disabled
for production installations. For development installations, enabling this
provides useful additional warnings and checks.

Even when this is disabled, using ResourceLoader's debug mode (?debug=true)
will cause the development version to be loaded.
@since 1.35

# MetaNamespace {#MetaNamespace}
Name of the project namespace. If left set to false, $wgSitename will be
used instead.

# MetaNamespaceTalk {#MetaNamespaceTalk}
Name of the project talk namespace.

Normally you can ignore this and it will be something like
$wgMetaNamespace . "_talk". In some languages, you may want to set this
manually for grammatical reasons.

# CanonicalNamespaceNames {#CanonicalNamespaceNames}
Canonical namespace names.

Must not be changed directly in configuration or by extensions, use $wgExtraNamespaces instead.

# ExtraNamespaces {#ExtraNamespaces}
Additional namespaces. If the namespaces defined in Language.php and
Namespace.php are insufficient, you can create new ones here, for example,
to import Help files in other languages. You can also override the namespace
names of existing namespaces. Extensions should use the CanonicalNamespaces
hook or extension.json.
@warning Once you delete a namespace, the pages in that namespace will
no longer be accessible. If you rename it, then you can access them through
the new namespace name.

Custom namespaces should start at 100 to avoid conflicting with standard
namespaces, and should always follow the even/odd main/talk pattern.

**Example:**

```
$wgExtraNamespaces = [
   100 => "Hilfe",
   101 => "Hilfe_Diskussion",
   102 => "Aide",
   103 => "Discussion_Aide"
];
```
@todo Add a note about maintenance/namespaceDupes.php

# ExtraGenderNamespaces {#ExtraGenderNamespaces}
Same as above, but for namespaces with gender distinction.

Note: the default form for the namespace should also be set
using $wgExtraNamespaces for the same index.
@since 1.18

# NamespaceAliases {#NamespaceAliases}
Define extra namespace aliases.

These are alternate names for the primary localised namespace names, which
are defined by $wgExtraNamespaces and the language file. If a page is
requested with such a prefix, the request will be redirected to the primary
name.

Set this to a map from namespace names to IDs.

**Example:**

```
$wgNamespaceAliases = [
    'Wikipedian' => NS_USER,
    'Help' => 100,
];
```
@see \Language::getNamespaceAliases for accessing the full list of aliases,
including those defined by other means.

# LegalTitleChars {#LegalTitleChars}
Allowed title characters -- regex character class
Don't change this unless you know what you're doing

Problematic punctuation:
  -  []}|#     Are needed for link syntax, never enable these
  -  <>        Causes problems with HTML escaping, don't use
  -  %         Enabled by default, minor problems with path to query rewrite rules, see below
  -  +         Enabled by default, but doesn't work with path to query rewrite rules,
               corrupted by apache
  -  ?         Enabled by default, but doesn't work with path to PATH_INFO rewrites

All three of these punctuation problems can be avoided by using an alias,
instead of a rewrite rule of either variety.

The problem with % is that when using a path to query rewrite rule, URLs are
double-unescaped: once by Apache's path conversion code, and again by PHP. So
%253F, for example, becomes "?". Our code does not double-escape to compensate
for this, indeed double escaping would break if the double-escaped title was
passed in the query string rather than the path. This is a minor security issue
because articles can be created such that they are hard to view or edit.

In some rare cases you may wish to remove + for compatibility with old links.

# CapitalLinks {#CapitalLinks}
Set this to false to avoid forcing the first letter of links to capitals.
@warning may break links! This makes links COMPLETELY case-sensitive. Links
appearing with a capital at the beginning of a sentence will *not* go to the
same place as links in the middle of a sentence using a lowercase initial.

# CapitalLinkOverrides {#CapitalLinkOverrides}

@since 1.16 - This can now be set per-namespace. Some special namespaces (such as Special, see
NamespaceInfo::$alwaysCapitalizedNamespaces for the full list) must be true by default (and
setting them has no effect), due to various things that require them to be so. Also, since Talk
namespaces need to directly mirror their associated content namespaces, the values for those are
ignored in favor of the subject namespace's setting. Setting for NS_MEDIA is taken automatically
from NS_FILE.

**Example:**

```
$wgCapitalLinkOverrides[ NS_FILE ] = false;
```

# NamespacesWithSubpages {#NamespacesWithSubpages}
Which namespaces should support subpages?
See Language.php for a list of namespaces.

# ContentNamespaces {#ContentNamespaces}
Array of namespaces which can be deemed to contain valid "content", as far
as the site statistics are concerned. Useful if additional namespaces also
contain "content" which should be considered when generating a count of the
number of articles in the wiki.

# ShortPagesNamespaceExclusions {#ShortPagesNamespaceExclusions}
Optional array of namespaces which should be excluded from Special:ShortPages.

Only pages inside $wgContentNamespaces but not $wgShortPagesNamespaceExclusions will
be shown on that page.
@since 1.37; previously $wgShortPagesNamespaceBlacklist

# ExtraSignatureNamespaces {#ExtraSignatureNamespaces}
Array of namespaces, in addition to the talk namespaces, where signatures
(~~~~) are likely to be used. This determines whether to display the
Signature button on the edit toolbar, and may also be used by extensions.

For example, "traditional" style wikis, where content and discussion are
intermixed, could place NS_MAIN and NS_PROJECT namespaces in this array.

# MaxRedirects {#MaxRedirects}
Max number of redirects to follow when resolving redirects.

1 means only the first redirect is followed (default behavior).
0 or less means no redirects are followed.

# InvalidRedirectTargets {#InvalidRedirectTargets}
Array of invalid page redirect targets.

Attempting to create a redirect to any of the pages in this array
will make the redirect fail.
Userlogout is hard-coded, so it does not need to be listed here.
(T12569) Disallow Mypage and Mytalk as well.

As of now, this only checks special pages. Redirects to pages in
other namespaces cannot be invalidated by this variable.

# DisableHardRedirects {#DisableHardRedirects}
Disable redirects to special pages and interwiki redirects, which use a 302
and have no "redirected from" link.
@note This is only for articles with #REDIRECT in them. URL's containing a
local interwiki prefix (or a non-canonical special page name) are still hard
redirected regardless of this setting.

# FixDoubleRedirects {#FixDoubleRedirects}
Fix double redirects after a page move.

Tends to conflict with page move vandalism, use only on a private wiki.

# InterwikiPrefixDisplayTypes {#InterwikiPrefixDisplayTypes}
Mapping of interwiki index prefixes to descriptors that
can be used to change the display of interwiki search results.

Descriptors are appended to CSS classes of interwiki results
which using InterwikiSearchResultWidget.

Predefined descriptors include the following words:
definition, textbook, news, quotation, book, travel, course

**Example:**

```
$wgInterwikiPrefixDisplayTypes = [
'iwprefix' => 'definition'
];
```

# LocalInterwikis {#LocalInterwikis}
Array for local interwiki values, for each of the interwiki prefixes that point to
the current wiki.

Note, recent changes feeds use only the first entry in this array. See $wgRCFeeds.

# InterwikiExpiry {#InterwikiExpiry}
Expiry time for cache of interwiki table

# InterwikiCache {#InterwikiCache}
Interwiki cache, either as an associative array or a path to a constant
database (.cdb) file.

This data structure database is generated by the `dumpInterwiki` maintenance
script (which lives in the WikimediaMaintenance repository) and has key
formats such as the following:

 - dbname:key - a simple key (e.g. enwiki:meta)
 - _sitename:key - site-scope key (e.g. wiktionary:meta)
 - __global:key - global-scope key (e.g. __global:meta)
 - __sites:dbname - site mapping (e.g. __sites:enwiki)

Sites mapping just specifies site name, other keys provide "local url"
data layout.

# InterwikiScopes {#InterwikiScopes}
Specify number of domains to check for messages.

- 1: Just wiki(db)-level
- 2: wiki and global levels
- 3: site levels

# InterwikiFallbackSite {#InterwikiFallbackSite}
Fallback site, if unable to resolve from cache

# RedirectSources {#RedirectSources}
If local interwikis are set up which allow redirects,
set this regexp to restrict URLs which will be displayed
as 'redirected from' links.

**Example:**
It might look something like this:

```
$wgRedirectSources = '!^https?://[a-z-]+\.wikipedia\.org/!';
```

Leave at false to avoid displaying any incoming redirect markers.
This does not affect intra-wiki redirects, which don't change
the URL.

# SiteTypes {#SiteTypes}
Register handlers for specific types of sites.
@since 1.21

# MaxTocLevel {#MaxTocLevel}
Maximum indent level of toc.

# MaxPPNodeCount {#MaxPPNodeCount}
A complexity limit on template expansion: the maximum number of nodes visited
by PPFrame::expand()

# MaxTemplateDepth {#MaxTemplateDepth}
Maximum recursion depth for templates within templates.

The current parser adds two levels to the PHP call stack for each template,
and xdebug limits the call stack to 256 by default. So this should hopefully
stop the parser before it hits the xdebug limit.

# MaxPPExpandDepth {#MaxPPExpandDepth}

@see $wgMaxTemplateDepth

# UrlProtocols {#UrlProtocols}
URL schemes that should be recognized as valid by wfParseUrl().

WARNING: Do not add 'file:' to this or internal file links will be broken.
Instead, if you want to support file links, add 'file://'. The same applies
to any other protocols with the same name as a namespace. See task T46011 for
more information.
@see \wfParseUrl

# CleanSignatures {#CleanSignatures}
If true, removes (by substituting) templates in signatures.

# AllowExternalImages {#AllowExternalImages}
Whether to allow inline image pointing to other websites

# AllowExternalImagesFrom {#AllowExternalImagesFrom}
If the above is false, you can specify an exception here. Image URLs
that start with this string are then rendered, while all others are not.

You can use this to set up a trusted, simple repository of images.
You may also specify an array of strings to allow multiple sites

**Examples:**

```
$wgAllowExternalImagesFrom = 'http://127.0.0.1/';
$wgAllowExternalImagesFrom = [ 'http://127.0.0.1/', 'http://example.com' ];
```

# EnableImageWhitelist {#EnableImageWhitelist}
If $wgAllowExternalImages is false, you can allow an on-wiki
allow list of regular expression fragments to match the image URL
against. If the image matches one of the regular expression fragments,
the image will be displayed.

Set this to true to enable the on-wiki allow list (MediaWiki:External image whitelist)
Or false to disable it
@since 1.14

# AllowImageTag {#AllowImageTag}
A different approach to the above: simply allow the "<img>" tag to be used.

This allows you to specify alt text and other attributes, copy-paste HTML to
your wiki more easily, etc.  However, allowing external images in any manner
will allow anyone with editing rights to snoop on your visitors' IP
addresses and so forth, if they wanted to, by inserting links to images on
sites they control.
@deprecated since 1.35; register an extension tag named <img> instead.

# TidyConfig {#TidyConfig}
Configuration for HTML postprocessing tool. Set this to a configuration
array to enable an external tool. By default, we now use the RemexHtml
library; historically, other postprocessors were used.

Setting this to null will use default settings.

Keys include:
 - treeMutationTrace: a boolean to turn on Remex tracing
 - serializerTrace: a boolean to turn on Remex tracing
 - mungerTrace: a boolean to turn on Remex tracing
 - pwrap: whether <p> wrapping should be done (default true)

See includes/tidy/RemexDriver.php for detail on configuration.

Overriding the default configuration is strongly discouraged in
production.

# ParserEnableLegacyMediaDOM {#ParserEnableLegacyMediaDOM}
Enable legacy media HTML structure in the output from the Parser.  The
alternative modern HTML structure that replaces it is described at
https://www.mediawiki.org/wiki/Parsing/Media_structure
@since 1.36

# UseContentMediaStyles {#UseContentMediaStyles}
Temporary flag to ship the styles for the media HTML structure that replaces
legacy, when $wgParserEnableLegacyMediaDOM is `false`.  This is configured
separately so that it can continue to be served after the latter is disabled
but still in the cache.
@internal

# RawHtml {#RawHtml}
Allow raw, unchecked HTML in "<html>...</html>" sections.

THIS IS VERY DANGEROUS on a publicly editable site, so USE $wgGroupPermissions
TO RESTRICT EDITING to only those that you trust

# ExternalLinkTarget {#ExternalLinkTarget}
Set a default target for external links, e.g. _blank to pop up a new window.

This will also set the "noreferrer" and "noopener" link rel to prevent the
attack described at https://mathiasbynens.github.io/rel-noopener/ .
Some older browsers may not support these link attributes, hence
setting $wgExternalLinkTarget to _blank may represent a security risk
to some of your users.

# NoFollowLinks {#NoFollowLinks}
If true, external URL links in wiki text will be given the
rel="nofollow" attribute as a hint to search engines that
they should not be followed for ranking purposes as they
are user-supplied and thus subject to spamming.

# NoFollowNsExceptions {#NoFollowNsExceptions}
Namespaces in which $wgNoFollowLinks doesn't apply.

See Language.php for a list of namespaces.

# NoFollowDomainExceptions {#NoFollowDomainExceptions}
If this is set to an array of domains, external links to these domain names
(or any subdomains) will not be set to rel="nofollow" regardless of the
value of $wgNoFollowLinks.  For instance:

$wgNoFollowDomainExceptions = [ 'en.wikipedia.org', 'wiktionary.org', 'mediawiki.org' ];

This would add rel="nofollow" to links to de.wikipedia.org, but not
en.wikipedia.org, wiktionary.org, en.wiktionary.org, us.en.wikipedia.org,
etc.

Defaults to mediawiki.org for the links included in the software by default.

# RegisterInternalExternals {#RegisterInternalExternals}
By default MediaWiki does not register links pointing to same server in
externallinks dataset, use this value to override:

# AllowDisplayTitle {#AllowDisplayTitle}
Allow DISPLAYTITLE to change title display

# RestrictDisplayTitle {#RestrictDisplayTitle}
For consistency, restrict DISPLAYTITLE to text that normalizes to the same
canonical DB key. Also disallow some inline CSS rules like display: none;
which can cause the text to be hidden or unselectable.

# ExpensiveParserFunctionLimit {#ExpensiveParserFunctionLimit}
Maximum number of calls per parse to expensive parser functions such as
PAGESINCATEGORY.

# PreprocessorCacheThreshold {#PreprocessorCacheThreshold}
Preprocessor caching threshold
Setting it to 'false' will disable the preprocessor cache.

# EnableScaryTranscluding {#EnableScaryTranscluding}
Enable interwiki transcluding.  Only when iw_trans=1 in the interwiki table.

# TranscludeCacheExpiry {#TranscludeCacheExpiry}
Expiry time for transcluded templates cached in object cache.

Only used $wgEnableInterwikiTranscluding is set to true.

# EnableMagicLinks {#EnableMagicLinks}
Enable the magic links feature of automatically turning ISBN xxx,
PMID xxx, RFC xxx into links
@since 1.28

# ArticleCountMethod {#ArticleCountMethod}
Method used to determine if a page in a content namespace should be counted
as a valid article.

Redirect pages will never be counted as valid articles.

This variable can have the following values:
- 'any': all pages as considered as valid articles
- 'link': the page must contain a [[wiki link]] to be considered valid

See also See https://www.mediawiki.org/wiki/Manual:Article_count

Retroactively changing this variable will not affect the existing count,
to update it, you will need to run the maintenance/updateArticleCount.php
script.

# ActiveUserDays {#ActiveUserDays}
How many days user must be idle before he is considered inactive. Will affect
the number shown on Special:Statistics, Special:ActiveUsers, and the
{{NUMBEROFACTIVEUSERS}} magic word in wikitext.

You might want to leave this as the default value, to provide comparable
numbers between different wikis.

# LearnerEdits {#LearnerEdits}
The following variables define 3 user experience levels:

- newcomer: has not yet reached the 'learner' level

- learner: has at least $wgLearnerEdits and has been
           a member for $wgLearnerMemberSince days
           but has not yet reached the 'experienced' level.

- experienced: has at least $wgExperiencedUserEdits edits and
               has been a member for $wgExperiencedUserMemberSince days.

# LearnerMemberSince {#LearnerMemberSince}
Number of days the user must exist before becoming a learner.
@see $wgLearnerEdits

# ExperiencedUserEdits {#ExperiencedUserEdits}
Number of edits the user must have before becoming "experienced".
@see $wgLearnerEdits

# ExperiencedUserMemberSince {#ExperiencedUserMemberSince}
Number of days the user must exist before becoming "experienced".
@see $wgLearnerEdits

# ManualRevertSearchRadius {#ManualRevertSearchRadius}
Maximum number of revisions of a page that will be checked against every new edit
made to determine whether the edit was a manual revert.

Computational time required increases roughly linearly with this configuration
variable.

Larger values will let you detect very deep reverts, but at the same time can give
unexpected results (such as marking large amounts of edits as reverts) and may slow
down the wiki slightly when saving new edits.

Setting this to 0 will disable the manual revert detection feature entirely.

See this document for a discussion on this topic:
https://meta.wikimedia.org/wiki/Research:Revert
@since 1.36

# RevertedTagMaxDepth {#RevertedTagMaxDepth}
Maximum depth (revision count) of reverts that will have their reverted edits marked
with the mw-reverted change tag. Reverts deeper than that will not have any edits
marked as reverted at all.

Large values can lead to lots of revisions being marked as "reverted", which may appear
confusing to users.

Setting this to 0 will disable the reverted tag entirely.
@since 1.36

# CentralIdLookupProviders {#CentralIdLookupProviders}
Central ID lookup providers
Key is the provider ID, value is a specification for ObjectFactory
@since 1.27

# CentralIdLookupProvider {#CentralIdLookupProvider}
Central ID lookup provider to use by default

# PasswordPolicy {#PasswordPolicy}
Password policy for the wiki.

Structured as
[
    'policies' => [ <group> => [ <policy> => <settings>, ... ], ... ],
    'checks' => [ <policy> => <callback>, ... ],
]
where <group> is a user group, <policy> is a password policy name
(arbitrary string) defined in the 'checks' part, <callback> is the
PHP callable implementing the policy check, <settings> is an array
of options with the following keys:
- value: (number, boolean or null) the value to pass to the callback
- forceChange: (boolean, default false) if the password is invalid, do
  not let the user log in without changing the password
- suggestChangeOnLogin: (boolean, default false) if true and the password is
  invalid, suggest a password change if logging in. If all the failing policies
  that apply to the user have this set to false, the password change
  screen will not be shown. 'forceChange' takes precedence over
  'suggestChangeOnLogin' if they are both present.
As a shorthand for [ 'value' => <value> ], simply <value> can be written.
When multiple password policies are defined for a user, the settings
arrays are merged, and for fields which are set in both arrays, the
larger value (as understood by PHP's 'max' method) is taken.

A user's effective policy is the superset of all policy statements
from the policies for the groups where the user is a member. If more
than one group policy include the same policy statement, the value is
the max() of the values. Note true > false. The 'default' policy group
is required, and serves as the minimum policy for all users.

Callbacks receive three arguments: the policy value, the User object
and the password; and must return a StatusValue. A non-good status
means the password will not be accepted for new accounts, and existing
accounts will be prompted for password change or barred from logging in
(depending on whether the status is a fatal or merely error/warning).

The checks supported by core are:
- MinimalPasswordLength - Minimum length a user can set.
- MinimumPasswordLengthToLogin - Passwords shorter than this will
	not be allowed to login, or offered a chance to reset their password
	as part of the login workflow, regardless if it is correct.
- MaximalPasswordLength - maximum length password a user is allowed
	to attempt. Prevents DoS attacks with pbkdf2.
- PasswordCannotBeSubstringInUsername - Password cannot be a substring
	(contained within) the username.
- PasswordCannotMatchDefaults - Username/password combination cannot
	match a list of default passwords used by MediaWiki in the past.
- PasswordNotInCommonList - Password not in best practices list of
	100,000 commonly used passwords. Due to the size of the list this
	is a probabilistic test.

If you add custom checks, for Special:PasswordPolicies to display them correctly,
every check should have a corresponding passwordpolicies-policy-<check> message,
and every settings field other than 'value' should have a corresponding
passwordpolicies-policyflag-<flag> message (<check> and <flag> are in lowercase).
The check message receives the policy value as a parameter, the flag message
receives the flag value (or values if it's an array).
@since 1.26
@see \PasswordPolicyChecks
@see \User::checkPasswordValidity()

# AuthManagerConfig {#AuthManagerConfig}
Configure AuthManager

All providers are constructed using ObjectFactory, see that for the general
structure. The array may also contain a key "sort" used to order providers:
providers are stably sorted by this value, which should be an integer
(default is 0).

Elements are:
- preauth: Array (keys ignored) of specifications for PreAuthenticationProviders
- primaryauth: Array (keys ignored) of specifications for PrimaryAuthenticationProviders
- secondaryauth: Array (keys ignored) of specifications for SecondaryAuthenticationProviders
@since 1.27
@note If this is null or empty, the value from $wgAuthManagerAutoConfig is
used instead. Local customization should generally set this variable from
scratch to the desired configuration. Extensions that want to
auto-configure themselves should use $wgAuthManagerAutoConfig instead.

# AuthManagerAutoConfig {#AuthManagerAutoConfig}
@see $wgAuthManagerConfig
@since 1.27

# RememberMe {#RememberMe}
Configures RememberMe authentication request added by AuthManager. It can show a "remember
me" checkbox that, when checked, will cause it to take more time for the authenticated session
to expire. It can also be configured to always or to never extend the authentication session.

Valid values are listed in RememberMeAuthenticationRequest::ALLOWED_FLAGS.
@since 1.36

# ReauthenticateTime {#ReauthenticateTime}
Time frame for re-authentication.

With only password-based authentication, you'd just ask the user to re-enter
their password to verify certain operations like changing the password or
changing the account's email address. But under AuthManager, the user might
not have a password (you might even have to redirect the browser to a
third-party service or something complex like that), you might want to have
both factors of a two-factor authentication, and so on. So, the options are:
- Incorporate the whole multi-step authentication flow within everything
  that needs to do this.
- Consider it good if they used Special:UserLogin during this session within
  the last X seconds.
- Come up with a third option.

MediaWiki currently takes the second option. This setting configures the
"X seconds".

This allows for configuring different time frames for different
"operations". The operations used in MediaWiki core include:
- LinkAccounts
- UnlinkAccount
- ChangeCredentials
- RemoveCredentials
- ChangeEmail

Additional operations may be used by extensions, either explicitly by
calling AuthManager::securitySensitiveOperationStatus(),
ApiAuthManagerHelper::securitySensitiveOperation() or
SpecialPage::checkLoginSecurityLevel(), or implicitly by overriding
SpecialPage::getLoginSecurityLevel() or by subclassing
AuthManagerSpecialPage.

The key 'default' is used if a requested operation isn't defined in the array.
@since 1.27

# AllowSecuritySensitiveOperationIfCannotReauthenticate {#AllowSecuritySensitiveOperationIfCannotReauthenticate}
Whether to allow security-sensitive operations when re-authentication is not possible.

If AuthManager::canAuthenticateNow() is false (e.g. the current
SessionProvider is not able to change users, such as when OAuth is in use),
AuthManager::securitySensitiveOperationStatus() cannot sensibly return
SEC_REAUTH. Setting an operation true here will have it return SEC_OK in
that case, while setting it false will have it return SEC_FAIL.

The key 'default' is used if a requested operation isn't defined in the array.
@since 1.27
@see $wgReauthenticateTime

# ChangeCredentialsBlacklist {#ChangeCredentialsBlacklist}
List of AuthenticationRequest class names which are not changeable through
Special:ChangeCredentials and the changeauthenticationdata API.

This is only enforced on the client level; AuthManager itself (e.g.
AuthManager::allowsAuthenticationDataChange calls) is not affected.
Class names are checked for exact match (not for subclasses).
@since 1.27

# RemoveCredentialsBlacklist {#RemoveCredentialsBlacklist}
List of AuthenticationRequest class names which are not removable through
Special:RemoveCredentials and the removeauthenticationdata API.

This is only enforced on the client level; AuthManager itself (e.g.
AuthManager::allowsAuthenticationDataChange calls) is not affected.
Class names are checked for exact match (not for subclasses).
@since 1.27

# MinimalPasswordLength {#MinimalPasswordLength}
Specifies the minimal length of a user password. If set to 0, empty pass-
words are allowed.
@deprecated since 1.26, use $wgPasswordPolicy's MinimalPasswordLength.

# MaximalPasswordLength {#MaximalPasswordLength}
Specifies the maximal length of a user password (T64685).

It is not recommended to make this greater than the default, as it can
allow DoS attacks by users setting really long passwords. In addition,
this should not be lowered too much, as it enforces weak passwords.
@warning Unlike other password settings, user with passwords greater than
the maximum will not be able to log in.
@deprecated since 1.26, use $wgPasswordPolicy's MaximalPasswordLength.

# InvalidPasswordReset {#InvalidPasswordReset}
Specifies if users should be sent to a password-reset form on login, if their
password doesn't meet the requirements of User::isValidPassword().
@since 1.23

# PasswordDefault {#PasswordDefault}
Default password type to use when hashing user passwords.

Must be set to a type defined in $wgPasswordConfig, or a type that
is registered by default in PasswordFactory.php.
@since 1.24

# PasswordConfig {#PasswordConfig}
Configuration for built-in password types. Maps the password type
to an array of options. The 'class' option is the Password class to
use. All other options are class-dependent.

An advanced example:

```
$wgPasswordConfig['bcrypt-peppered'] = [
    'class' => EncryptedPassword::class,
    'underlying' => 'bcrypt',
    'secrets' => [
        hash( 'sha256', 'secret', true ),
    ],
    'cipher' => 'aes-256-cbc',
];
```
@since 1.24

# PasswordResetRoutes {#PasswordResetRoutes}
Whether to allow password resets ("enter some identifying data, and we'll send an email
with a temporary password you can use to get back into the account") identified by
various bits of data.  Setting all of these to false (or the whole variable to false)
has the effect of disabling password resets entirely

# MaxSigChars {#MaxSigChars}
Maximum number of Unicode characters in signature

# SignatureValidation {#SignatureValidation}
Behavior of signature validation. Allowed values are:
 - 'warning' - invalid signatures cause a warning to be displayed on the preferences page, but
   they are still used when signing comments; new invalid signatures can still be saved as normal
 - 'new' - existing invalid signatures behave as above; new invalid signatures can't be saved
 - 'disallow' - existing invalid signatures are no longer used when signing comments; new invalid
   signatures can't be saved
@since 1.35

# SignatureAllowedLintErrors {#SignatureAllowedLintErrors}
List of lint error codes which don't cause signature validation to fail.
@see https://www.mediawiki.org/wiki/Help:Lint_errors
@since 1.35

# MaxNameChars {#MaxNameChars}
Maximum number of bytes in username. You want to run the maintenance
script ./maintenance/checkUsernames.php once you have changed this value.

# ReservedUsernames {#ReservedUsernames}
Array of usernames which may not be registered or logged in from
Maintenance scripts can still use these
@see \User::MAINTENANCE_SCRIPT_USER

# DefaultUserOptions {#DefaultUserOptions}
Settings added to this array will override the default globals for the user
preferences used by anonymous visitors and newly created accounts.

For instance, to disable editing on double clicks:
$wgDefaultUserOptions ['editondblclick'] = 0;

# HiddenPrefs {#HiddenPrefs}
An array of preferences to not show for the user

# InvalidUsernameCharacters {#InvalidUsernameCharacters}
Characters to prevent during new account creations.

This is used in a regular expression character class during
registration (regex metacharacters like / are escaped).

# UserrightsInterwikiDelimiter {#UserrightsInterwikiDelimiter}
Character used as a delimiter when testing for interwiki userrights
(In Special:UserRights, it is possible to modify users on different
databases if the delimiter is used, e.g. "Someuser@enwiki").

It is recommended that you have this delimiter in
$wgInvalidUsernameCharacters above, or you will not be able to
modify the user rights of those users via Special:UserRights

# SecureLogin {#SecureLogin}
This is to let user authenticate using https when they come from http.

Based on an idea by George Herbert on wikitech-l:
https://lists.wikimedia.org/pipermail/wikitech-l/2010-October/050039.html
@since 1.17

# AuthenticationTokenVersion {#AuthenticationTokenVersion}
Versioning for authentication tokens.

If non-null, this is combined with the user's secret (the user_token field
in the DB) to generate the token cookie. Changing this will invalidate all
active sessions (i.e. it will log everyone out).
@since 1.27

# SessionProviders {#SessionProviders}
MediaWiki\Session\SessionProvider configuration.

Values are ObjectFactory specifications for the SessionProviders
to be used. Keys in the array are ignored. Order is not significant.
@since 1.27

# AllowRequiringEmailForResets {#AllowRequiringEmailForResets}
Temporary feature flag that controls whether users will see a checkbox allowing them to
require providing email during password resets.
@deprecated This feature is under development, don't assume this flag's existence or function
outside of MediaWiki.

# AutoblockExpiry {#AutoblockExpiry}
Number of seconds before autoblock entries expire. Default 86400 = 1 day.

# BlockAllowsUTEdit {#BlockAllowsUTEdit}
Set this to true to allow blocked users to edit their own user talk page.

This only applies to sitewide blocks. Partial blocks always allow users to
edit their own user talk page unless otherwise specified in the block
restrictions.

# BlockCIDRLimit {#BlockCIDRLimit}
Limits on the possible sizes of range blocks.

CIDR notation is hard to understand, it's easy to mistakenly assume that a
/1 is a small range and a /31 is a large range. For IPv4, setting a limit of
half the number of bits avoids such errors, and allows entire ISPs to be
blocked using a small number of range blocks.

For IPv6, RFC 3177 recommends that a /48 be allocated to every residential
customer, so range blocks larger than /64 (half the number of bits) will
plainly be required. RFC 4692 implies that a very large ISP may be
allocated a /19 if a generous HD-Ratio of 0.8 is used, so we will use that
as our limit. As of 2012, blocking the whole world would require a /4 range.

# BlockDisablesLogin {#BlockDisablesLogin}
If true, blocked users will not be allowed to login. When using this with
a public wiki, the effect of logging out blocked users may actually be
avers: unless the user's address is also blocked (e.g. auto-block),
logging the user out will again allow reading and editing, just as for
anonymous visitors.

# EnablePartialActionBlocks {#EnablePartialActionBlocks}
Flag to enable partial blocks against performing certain actions.
@unstable Temporary feature flag, to be removed before the release of 1.38: T280532

# WhitelistRead {#WhitelistRead}
Pages anonymous user may see, set as an array of pages titles.

**Example:**

```
$wgWhitelistRead = [ "Main Page", "Wikipedia:Help" ];
```

Special:Userlogin and Special:ChangePassword are always allowed.
@note This will only work if $wgGroupPermissions['*']['read'] is false --
see below. Otherwise, ALL pages are accessible, regardless of this setting.
@note Also that this will only protect _pages in the wiki_. Uploaded files
will remain readable. You can use img_auth.php to protect uploaded files,
see https://www.mediawiki.org/wiki/Manual:Image_Authorization
@note Extensions should not modify this, but use the TitleReadWhitelist
hook instead.

# WhitelistReadRegexp {#WhitelistReadRegexp}
Pages anonymous user may see, set as an array of regular expressions.

This function will match the regexp against the title name, which
is without underscore.

**Example:**
To whitelist [[Main Page]]:

```
$wgWhitelistReadRegexp = [ "/Main Page/" ];
```
@note Unless ^ and/or $ is specified, a regular expression might match
pages not intended to be allowed.  The above example will also
allow a page named 'Security Main Page'.

**Example:**
To allow reading any page starting with 'User' regardless of the case:

```
$wgWhitelistReadRegexp = [ "@^UsEr.*@i" ];
```

Will allow both [[User is banned]] and [[User:JohnDoe]]
@note This will only work if $wgGroupPermissions['*']['read'] is false --
see below. Otherwise, ALL pages are accessible, regardless of this setting.

# EmailConfirmToEdit {#EmailConfirmToEdit}
Should editors be required to have a validated e-mail
address before being allowed to edit?

# HideIdentifiableRedirects {#HideIdentifiableRedirects}
Should MediaWiki attempt to protect user's privacy when doing redirects?
Keep this true if access counts to articles are made public.

# GroupPermissions {#GroupPermissions}
Permission keys given to users in each group.

This is an array where the keys are all groups and each value is an
array of the format (right => boolean).

The second format is used to support per-namespace permissions.
Note that this feature does not fully work for all permission types.

All users are implicitly in the '*' group including anonymous visitors;
logged-in users are all implicitly in the 'user' group. These will be
combined with the permissions of all groups that a given user is listed
in the user_groups table.

Note: Don't set $wgGroupPermissions = []; unless you know what you're
doing! This will wipe all permissions, and may mean that your users are
unable to perform certain essential tasks or access new functionality
when new permissions are introduced and default grants established.

Functionality to make pages inaccessible has not been extensively tested
for security. Use at your own risk!

This replaces $wgWhitelistAccount and $wgWhitelistEdit

# RevokePermissions {#RevokePermissions}
Permission keys revoked from users in each group.

This acts the same way as $wgGroupPermissions above, except that
if the user is in a group here, the permission will be removed from them.

Improperly setting this could mean that your users will be unable to perform
certain essential tasks, so use at your own risk!

# GroupInheritsPermissions {#GroupInheritsPermissions}
Groups that should inherit permissions from another group

This allows defining a group that inherits its permissions
from another group without having to copy all the permission
grants over. For example, if you wanted a manual "confirmed"
group that had the same permissions as "autoconfirmed":

```
$wgGroupInheritsPermissions['confirmed'] = 'autoconfirmed';
```

Recursive inheritance is currently not supported. In the above
example, confirmed will only gain the permissions explicitly
granted (or revoked) from autoconfirmed, not any permissions
that autoconfirmed might inherit.
@since 1.38

# ImplicitGroups {#ImplicitGroups}
Implicit groups, aren't shown on Special:Listusers or somewhere else

# GroupsAddToSelf {#GroupsAddToSelf}
A map of group names that the user is in, to group names that those users
are allowed to add or revoke.

Setting the list of groups to add or revoke to true is equivalent to "any
group".

**Example:**
To allow sysops to add themselves to the "bot" group:

```
$wgGroupsAddToSelf = [ 'sysop' => [ 'bot' ] ];
```

**Example:**
Implicit groups may be used for the source group, for instance:

```
$wgGroupsRemoveFromSelf = [ '*' => true ];
```

This allows users in the '*' group (i.e. any user) to remove themselves from
any group that they happen to be in.

# GroupsRemoveFromSelf {#GroupsRemoveFromSelf}

@see $wgGroupsAddToSelf

# RestrictionTypes {#RestrictionTypes}
Set of available actions that can be restricted via action=protect
You probably shouldn't change this.

Translated through restriction-* messages.
Title::getRestrictionTypes() will remove restrictions that are not
applicable to a specific title (create and upload)

# RestrictionLevels {#RestrictionLevels}
Rights which can be required for each protection level (via action=protect)

You can add a new protection level that requires a specific
permission by manipulating this array. The ordering of elements
dictates the order on the protection form's lists.

  - '' will be ignored (i.e. unprotected)
  - 'autoconfirmed' is quietly rewritten to 'editsemiprotected' for backwards compatibility
  - 'sysop' is quietly rewritten to 'editprotected' for backwards compatibility

# CascadingRestrictionLevels {#CascadingRestrictionLevels}
Restriction levels that can be used with cascading protection

A page can only be protected with cascading protection if the
requested restriction level is included in this array.

'autoconfirmed' is quietly rewritten to 'editsemiprotected' for backwards compatibility.
'sysop' is quietly rewritten to 'editprotected' for backwards compatibility.

# SemiprotectedRestrictionLevels {#SemiprotectedRestrictionLevels}
Restriction levels that should be considered "semiprotected"

Certain places in the interface recognize a dichotomy between "protected"
and "semiprotected", without further distinguishing the specific levels. In
general, if anyone can be eligible to edit a protection level merely by
reaching some condition in $wgAutopromote, it should probably be considered
"semiprotected".

'autoconfirmed' is quietly rewritten to 'editsemiprotected' for backwards compatibility.
'sysop' is not changed, since it really shouldn't be here.

# NamespaceProtection {#NamespaceProtection}
Set the minimum permissions required to edit pages in each
namespace.  If you list more than one permission, a user must
have all of them to edit pages in that namespace.
@note NS_MEDIAWIKI is implicitly restricted to 'editinterface'.

# NonincludableNamespaces {#NonincludableNamespaces}
Pages in namespaces in this array can not be used as templates.

Elements MUST be numeric namespace ids, you can safely use the MediaWiki
namespaces constants (NS_USER, NS_MAIN...).

Among other things, this may be useful to enforce read-restrictions
which may otherwise be bypassed by using the template mechanism.

# AutoConfirmAge {#AutoConfirmAge}
Number of seconds an account is required to age before it's given the
implicit 'autoconfirm' group membership. This can be used to limit
privileges of new accounts.

Accounts created by earlier versions of the software may not have a
recorded creation date, and will always be considered to pass the age test.

When left at 0, all registered accounts will pass.

**Example:**
Set automatic confirmation to 10 minutes (which is 600 seconds):

```
$wgAutoConfirmAge = 600;     // ten minutes
```

Set age to one day:

```
$wgAutoConfirmAge = 3600*24; // one day
```

# AutoConfirmCount {#AutoConfirmCount}
Number of edits an account requires before it is autoconfirmed.

Passing both this AND the time requirement is needed. Example:

**Example:**

```
$wgAutoConfirmCount = 50;
```

# Autopromote {#Autopromote}
Array containing the conditions of automatic promotion of a user to specific groups.

The basic syntax for `$wgAutopromote` is:

    $wgAutopromote = [
        'groupname' => cond,
        'group2' => cond2,
    ];

A `cond` may be:
 - a single condition without arguments:
     Note that Autopromote wraps a single non-array value into an array
     e.g. `APCOND_EMAILCONFIRMED` OR
          [ `APCOND_EMAILCONFIRMED` ]
 - a single condition with arguments:
     e.g. `[ APCOND_EDITCOUNT, 100 ]`
 - a set of conditions:
     e.g. `[ 'operand', cond1, cond2, ... ]`

When constructing a set of conditions, the following conditions are available:
 - `&` (**AND**):
     promote if user matches **ALL** conditions
 - `|` (**OR**):
     promote if user matches **ANY** condition
 - `^` (**XOR**):
     promote if user matches **ONLY ONE OF THE CONDITIONS**
 - `!` (**NOT**):
     promote if user matces **NO** condition
 - [ APCOND_EMAILCONFIRMED ]:
     true if user has a confirmed e-mail
 - [ APCOND_EDITCOUNT, number of edits ]:
     true if user has the at least the number of edits as the passed parameter
 - [ APCOND_AGE, seconds since registration ]:
     true if the length of time since the user created his/her account
     is at least the same length of time as the passed parameter
 - [ APCOND_AGE_FROM_EDIT, seconds since first edit ]:
     true if the length of time since the user made his/her first edit
     is at least the same length of time as the passed parameter
 - [ APCOND_INGROUPS, group1, group2, ... ]:
     true if the user is a member of each of the passed groups
 - [ APCOND_ISIP, ip ]:
     true if the user has the passed IP address
 - [ APCOND_IPINRANGE, range ]:
     true if the user has an IP address in the range of the passed parameter
 - [ APCOND_BLOCKED ]:
     true if the user is sitewide blocked
 - [ APCOND_ISBOT ]:
     true if the user is a bot
 - similar constructs can be defined by extensions

The sets of conditions are evaluated recursively, so you can use nested sets of conditions
linked by operands.

Note that if $wgEmailAuthentication is disabled, APCOND_EMAILCONFIRMED will be true for any
user who has provided an e-mail address.

# AutopromoteOnce {#AutopromoteOnce}
Automatically add a usergroup to any user who matches certain conditions.

Does not add the user to the group again if it has been removed.
Also, does not remove the group if the user no longer meets the criteria.

The format is:

```
[ event => criteria, ... ]
```

Where event is either:
   - 'onEdit' (when user edits)

Criteria has the same format as $wgAutopromote
@see $wgAutopromote
@since 1.18

# AutopromoteOnceLogInRC {#AutopromoteOnceLogInRC}
Put user rights log entries for autopromotion in recent changes?
@since 1.18

# AddGroups {#AddGroups}
$wgAddGroups and $wgRemoveGroups can be used to give finer control over who
can assign which groups at Special:Userrights.

**Example:**
Bureaucrats can add any group:

```
$wgAddGroups['bureaucrat'] = true;
```

Bureaucrats can only remove bots and sysops:

```
$wgRemoveGroups['bureaucrat'] = [ 'bot', 'sysop' ];
```

Sysops can make bots:

```
$wgAddGroups['sysop'] = [ 'bot' ];
```

Sysops can disable other sysops in an emergency, and disable bots:

```
$wgRemoveGroups['sysop'] = [ 'sysop', 'bot' ];
```

# RemoveGroups {#RemoveGroups}

@see $wgAddGroups

# AvailableRights {#AvailableRights}
A list of available rights, in addition to the ones defined by the core.

For extensions only.

# DeleteRevisionsLimit {#DeleteRevisionsLimit}
Optional to restrict deletion of pages with higher revision counts
to users with the 'bigdelete' permission. (Default given to sysops.)

# DeleteRevisionsBatchSize {#DeleteRevisionsBatchSize}
Page deletions with > this number of revisions will use the job queue.

Revisions will be archived in batches of (at most) this size, one batch per job.

# HideUserContribLimit {#HideUserContribLimit}
The maximum number of edits a user can have and
can still be hidden by users with the hideuser permission.

This is limited for performance reason.
Set to false to disable the limit.
@since 1.23

# AccountCreationThrottle {#AccountCreationThrottle}
Number of accounts each IP address may create per specified period(s).

**Example:**

```
$wgAccountCreationThrottle = [
 // no more than 100 per month
 [
  'count' => 100,
  'seconds' => 30*86400,
 ],
 // no more than 10 per day
 [
  'count' => 10,
  'seconds' => 86400,
 ],
];
```
@warning Requires $wgMainCacheType to be enabled

# SpamRegex {#SpamRegex}
Edits matching these regular expressions in body text
will be recognised as spam and rejected automatically.

There's no administrator override on-wiki, so be careful what you set. :)
May be an array of regexes or a single string for backwards compatibility.
@see https://en.wikipedia.org/wiki/Regular_expression
@note Each regex needs a beginning/end delimiter, eg: # or /

# SummarySpamRegex {#SummarySpamRegex}
Same as SpamRegex except for edit summaries

# EnableDnsBlacklist {#EnableDnsBlacklist}
Whether to use DNS blacklists in $wgDnsBlacklistUrls to check for open
proxies
@since 1.16

# DnsBlacklistUrls {#DnsBlacklistUrls}
List of DNS blacklists to use, if $wgEnableDnsBlacklist is true.

This is an array of either a URL or an array with the URL and a key (should
the blacklist require a key).

**Example:**

```
$wgDnsBlacklistUrls = [
  // String containing URL
  'http.dnsbl.sorbs.net.',
  // Array with URL and key, for services that require a key
  [ 'dnsbl.httpbl.net.', 'mykey' ],
  // Array with just the URL. While this works, it is recommended that you
  // just use a string as shown above
  [ 'opm.tornevall.org.' ]
];
```
@note You should end the domain name with a . to avoid searching your
eventual domain search suffixes.
@since 1.16

# ProxyList {#ProxyList}
List of banned IP addresses.

This can have the following formats:
- An array of addresses
- A string, in which case this is the path to a file
  containing the list of IP addresses, one per line

# ProxyWhitelist {#ProxyWhitelist}
Proxy whitelist, list of addresses that are assumed to be non-proxy despite
what the other methods might say.

# SoftBlockRanges {#SoftBlockRanges}
IP ranges that should be considered soft-blocked (anon-only, account
creation allowed). The intent is to use this to prevent anonymous edits from
shared resources such as Wikimedia Labs.
@since 1.29

# ApplyIpBlocksToXff {#ApplyIpBlocksToXff}
Whether to look at the X-Forwarded-For header's list of (potentially spoofed)
IPs and apply IP blocks to them. This allows for IP blocks to work with correctly-configured
(transparent) proxies without needing to block the proxies themselves.

# RateLimits {#RateLimits}
Simple rate limiter options to brake edit floods.

Maximum number actions allowed in the given number of seconds; after that
the violating client receives HTTP 500 error pages until the period
elapses.

**Example:**
Limits per configured per action and then type of users.

```
$wgRateLimits = [
    'edit' => [
        'anon' => [ x, y ], // any and all anonymous edits (aggregate)
        'user' => [ x, y ], // each logged-in user
        'user-global' => [ x, y ], // per username, across all sites (assumes names are global)
        'newbie' => [ x, y ], // each new autoconfirmed accounts; overrides 'user'
        'ip' => [ x, y ], // each anon and recent account, across all sites
        'subnet' => [ x, y ], // ... within a /24 subnet in IPv4 or /64 in IPv6
        'ip-all' => [ x, y ], // per ip, across all sites
        'subnet-all' => [ x, y ], // ... within a /24 subnet in IPv4 or /64 in IPv6
        'groupName' => [ x, y ], // by group membership
    ]
];
```

**Normally, the 'noratelimit' right allows a user to bypass any rate**
limit checks. This can be disabled on a per-action basis by setting the
special '&can-bypass' key to false in that action's configuration.

```
$wgRateLimits = [
    'some-action' => [
        '&can-bypass' => false,
        'user' => [ x, y ],
];
```
@warning Requires that $wgMainCacheType is set to something persistent

# RateLimitsExcludedIPs {#RateLimitsExcludedIPs}
Array of IPs / CIDR ranges which should be excluded from rate limits.

This may be useful for allowing NAT gateways for conferences, etc.

# PutIPinRC {#PutIPinRC}
Log IP addresses in the recentchanges table; can be accessed only by
extensions (e.g. CheckUser) or a DB admin
Used for retroactive autoblocks

# QueryPageDefaultLimit {#QueryPageDefaultLimit}
Integer defining default number of entries to show on
special pages which are query-pages such as Special:Whatlinkshere.

# PasswordAttemptThrottle {#PasswordAttemptThrottle}
Limit password attempts to X attempts per Y seconds per IP per account.

Value is an array of arrays. Each sub-array must have a key for count
(ie count of how many attempts before throttle) and a key for seconds.
If the key 'allIPs' (case sensitive) is present, then the limit is
just per account instead of per IP per account.
@since 1.27 allIps support and multiple limits added in 1.27. Prior
to 1.27 this only supported having a single throttle.
@warning Requires $wgMainCacheType to be enabled

# GrantPermissions {#GrantPermissions}
Users authorize consumers (like Apps) to act on their behalf but only with
a subset of the user's normal account rights (signed off on by the user).
The possible rights to grant to a consumer are bundled into groups called
"grants". Each grant defines some rights it lets consumers inherit from the
account they may act on behalf of. Note that a user granting a right does
nothing if that user does not actually have that right to begin with.

@since 1.27

# GrantPermissionGroups {#GrantPermissionGroups}

@since 1.27

# EnableBotPasswords {#EnableBotPasswords}

@since 1.27

# BotPasswordsCluster {#BotPasswordsCluster}
Cluster for the bot_passwords table
@since 1.27

# BotPasswordsDatabase {#BotPasswordsDatabase}
Database name for the bot_passwords table

To use a database with a table prefix, set this variable to
"{$database}-{$prefix}".
@since 1.27

# SecretKey {#SecretKey}
This should always be customised in LocalSettings.php

# AllowUserJs {#AllowUserJs}
Allow user Javascript page?
This enables a lot of neat customizations, but may
increase security risk to users and server load.

# AllowUserCss {#AllowUserCss}
Allow user Cascading Style Sheets (CSS)?
This enables a lot of neat customizations, but may
increase security risk to users and server load.

# AllowUserCssPrefs {#AllowUserCssPrefs}
Allow style-related user-preferences?

This controls whether the `editfont` and `underline` preferences
are available to users.

# UseSiteJs {#UseSiteJs}
Use the site's Javascript page?

# UseSiteCss {#UseSiteCss}
Use the site's Cascading Style Sheets (CSS)?

# BreakFrames {#BreakFrames}
Break out of framesets. This can be used to prevent clickjacking attacks,
or to prevent external sites from framing your site with ads.

# EditPageFrameOptions {#EditPageFrameOptions}
The X-Frame-Options header to send on pages sensitive to clickjacking
attacks, such as edit pages. This prevents those pages from being displayed
in a frame or iframe. The options are:

- 'DENY': Do not allow framing. This is recommended for most wikis.

  - 'SAMEORIGIN': Allow framing by pages on the same domain. This can be used
        to allow framing within a trusted domain. This is insecure if there
        is a page on the same domain which allows framing of arbitrary URLs.

  - false: Allow all framing. This opens up the wiki to XSS attacks and thus
        full compromise of local user accounts. Private wikis behind a
        corporate firewall are especially vulnerable. This is not
        recommended.

For extra safety, set $wgBreakFrames = true, to prevent framing on all pages,
not just edit pages.

# ApiFrameOptions {#ApiFrameOptions}
Disallow framing of API pages directly, by setting the X-Frame-Options
header. Since the API returns CSRF tokens, allowing the results to be
framed can compromise your user's account security.

Options are:
  - 'DENY': Do not allow framing. This is recommended for most wikis.
  - 'SAMEORIGIN': Allow framing by pages on the same domain.
  - false: Allow all framing.
Note: $wgBreakFrames will override this for human formatted API output.

# CSPHeader {#CSPHeader}
Controls Content-Security-Policy header [Experimental]
@see https://www.w3.org/TR/CSP2/
@since 1.32
@warning May cause slowness on windows due to slow random number generator.

# CSPReportOnlyHeader {#CSPReportOnlyHeader}
Controls Content-Security-Policy-Report-Only header
@since 1.32

# CSPFalsePositiveUrls {#CSPFalsePositiveUrls}
List of urls which appear often to be triggering CSP reports
but do not appear to be caused by actual content, but by client
software inserting scripts (i.e. Ad-Ware).

List based on results from Wikimedia logs.
@since 1.28

# AllowCrossOrigin {#AllowCrossOrigin}
Allow anonymous cross origin requests.

This should be disabled for intranet sites (sites behind a firewall).
@since 1.36

# RestAllowCrossOriginCookieAuth {#RestAllowCrossOriginCookieAuth}
Allows authenticated cross-origin requests to the REST API with session cookies.

With this option enabled, any orgin specified in $wgCrossSiteAJAXdomains may send session cookies
for authorization in the REST API.

There is a performance impact by enabling this option. Therefore, it should be left disabled for
most wikis and clients should instead use OAuth to make cross-origin authenticated requests.
@see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials
@since 1.36

# SessionSecret {#SessionSecret}
Secret for session storage.

This should be set in LocalSettings.php, otherwise $wgSecretKey will
be used.
@since 1.27

# SessionInsecureSecrets {#SessionInsecureSecrets}
If for some reason you can't install the PHP OpenSSL extension,
you can set this to true to make MediaWiki work again at the cost of storing
sensitive session data insecurely. But it would be much more secure to just
install the OpenSSL extension.
@since 1.27

# HKDFSecret {#HKDFSecret}
Secret for hmac-based key derivation function (fast,
cryptographically secure random numbers).

This should be set in LocalSettings.php, otherwise $wgSecretKey will
be used.
See also: $wgHKDFAlgorithm
@since 1.24

# HKDFAlgorithm {#HKDFAlgorithm}
Algorithm for hmac-based key derivation function (fast,
cryptographically secure random numbers).

See also: $wgHKDFSecret
@since 1.24

# CookieExpiration {#CookieExpiration}
Default cookie lifetime, in seconds. Setting to 0 makes all cookies session-only.

# ExtendedLoginCookieExpiration {#ExtendedLoginCookieExpiration}
Default login cookie lifetime, in seconds. Setting
$wgExtendLoginCookieExpiration to null will use $wgCookieExpiration to
calculate the cookie lifetime. As with $wgCookieExpiration, 0 will make
login cookies session-only.

# CookieDomain {#CookieDomain}
Set to set an explicit domain on the login cookies eg, "justthis.domain.org"
or ".any.subdomain.net"

# CookiePath {#CookiePath}
Set this variable if you want to restrict cookies to a certain path within
the domain specified by $wgCookieDomain.

# CookieSecure {#CookieSecure}
Whether the "secure" flag should be set on the cookie. This can be:
  - true:      Set secure flag
  - false:     Don't set secure flag
  - "detect":  Set the secure flag if $wgServer is set to an HTTPS URL,
               or if $wgForceHTTPS is true.

If $wgForceHTTPS is true, session cookies will be secure regardless of this
setting. However, other cookies will still be affected.

# DisableCookieCheck {#DisableCookieCheck}
By default, MediaWiki checks if the client supports cookies during the
login process, so that it can display an informative error message if
cookies are disabled. Set this to true if you want to disable this cookie
check.

# CookiePrefix {#CookiePrefix}
Cookies generated by MediaWiki have names starting with this prefix. Set it
to a string to use a custom prefix. Setting it to false causes the database
name to be used as a prefix.

# CookieHttpOnly {#CookieHttpOnly}
Set authentication cookies to HttpOnly to prevent access by JavaScript,
in browsers that support this feature. This can mitigates some classes of
XSS attack.

# CookieSameSite {#CookieSameSite}
The SameSite cookie attribute used for login cookies. This can be "Lax",
"Strict", "None" or empty/null to omit the attribute.

This only applies to login cookies, since the correct value for other
cookies depends on what kind of cookie it is.
@since 1.35

# UseSameSiteLegacyCookies {#UseSameSiteLegacyCookies}
If true, when a cross-site cookie with SameSite=None is sent, a legacy
cookie with an "ss0" prefix will also be sent, without SameSite=None. This
is a workaround for broken behaviour in Chrome 51-66 and similar browsers.
@since 1.35

# CacheVaryCookies {#CacheVaryCookies}
A list of cookies that vary the cache (for use by extensions)

# SessionName {#SessionName}
Override to customise the session name

# CookieSetOnAutoblock {#CookieSetOnAutoblock}
Whether to set a cookie when a user is autoblocked. Doing so means that a blocked user, even
after logging out and moving to a new IP address, will still be blocked. This cookie will contain
an authentication code if $wgSecretKey is set, or otherwise will just be the block ID (in
which case there is a possibility of an attacker discovering the names of revdeleted users, so
it is best to use this in conjunction with $wgSecretKey being set).

# CookieSetOnIpBlock {#CookieSetOnIpBlock}
Whether to set a cookie when a logged-out user is blocked. Doing so means that a blocked user,
even after moving to a new IP address, will still be blocked. This cookie will contain an
authentication code if $wgSecretKey is set, or otherwise will just be the block ID (in which
case there is a possibility of an attacker discovering the names of revdeleted users, so it
is best to use this in conjunction with $wgSecretKey being set).

# DebugLogFile {#DebugLogFile}
Filename for debug logging. See https://www.mediawiki.org/wiki/How_to_debug
The debug log file should be not be publicly accessible if it is used, as it
may contain private data.

# DebugLogPrefix {#DebugLogPrefix}
Prefix for debug log lines

# DebugRedirects {#DebugRedirects}
If true, instead of redirecting, show a page with a link to the redirect
destination. This allows for the inspection of PHP error messages, and easy
resubmission of form data. For developer use only.

# DebugRawPage {#DebugRawPage}
If true, log debugging data from action=raw and load.php.

This is normally false to avoid overlapping debug entries due to gen=css
and gen=js requests.

# DebugComments {#DebugComments}
Send debug data to an HTML comment in the output.

This may occasionally be useful when supporting a non-technical end-user.
It's more secure than exposing the debug log file to the web, since the
output only contains private data for the current user. But it's not ideal
for development use since data is lost on fatal errors and redirects.

# DebugDumpSql {#DebugDumpSql}
Write SQL queries to the debug log.

This setting is only used $wgLBFactoryConf['class'] is set to
'\Wikimedia\Rdbms\LBFactorySimple'; otherwise the DBO_DEBUG flag must be set in
the 'flags' option of the database connection to achieve the same functionality.

# TrxProfilerLimits {#TrxProfilerLimits}
Performance expectations for DB usage
@since 1.26

# DebugLogGroups {#DebugLogGroups}
Map of string log group names to log destinations.

If set, wfDebugLog() output for that group will go to that file instead
of the regular $wgDebugLogFile. Useful for enabling selective logging
in production.

Log destinations may be one of the following:
- false to completely remove from the output, including from $wgDebugLogFile.
- string values specifying a filename or URI.
- associative array with keys:
  - 'destination' desired filename or URI.
  - 'sample' an integer value, specifying a sampling factor (optional)
  - 'level' A \Psr\Log\LogLevel constant, indicating the minimum level
            to log (optional, since 1.25)

**Example:**

```
$wgDebugLogGroups['redis'] = '/var/log/mediawiki/redis.log';
```

**Advanced example:**

```
$wgDebugLogGroups['memcached'] = [
    'destination' => '/var/log/mediawiki/memcached.log',
    'sample' => 1000,  // log 1 message out of every 1,000.
    'level' => \Psr\Log\LogLevel::WARNING
];
```

# MWLoggerDefaultSpi {#MWLoggerDefaultSpi}
Default service provider for creating Psr\Log\LoggerInterface instances.

The value should be an array suitable for use with
ObjectFactory::getObjectFromSpec(). The created object is expected to
implement the MediaWiki\Logger\Spi interface. See ObjectFactory for additional
details.

Alternately the MediaWiki\Logger\LoggerFactory::registerProvider method can
be called to inject an MediaWiki\Logger\Spi instance into the LoggerFactory
and bypass the use of this configuration variable entirely.

**To completely disable logging:**

```
$wgMWLoggerDefaultSpi = [ 'class' => \MediaWiki\Logger\NullSpi::class ];
```
@since 1.25
@see \MwLogger

# ShowDebug {#ShowDebug}
Display debug data at the bottom of the main content area.

Useful for developers and technical users trying to working on a closed wiki.

# SpecialVersionShowHooks {#SpecialVersionShowHooks}
Show the contents of $wgHooks in Special:Version

# ShowExceptionDetails {#ShowExceptionDetails}
If set to true, uncaught exceptions will print the exception message and a
complete stack trace to output. This should only be used for debugging, as it
may reveal private information in function parameters due to PHP's backtrace
formatting.  If set to false, only the exception's class will be shown.

# LogExceptionBacktrace {#LogExceptionBacktrace}
If true, send the exception backtrace to the error log

# PropagateErrors {#PropagateErrors}
If true, the MediaWiki error handler passes errors/warnings to the default error handler
after logging them. The setting is ignored when the track_errors php.ini flag is true.

# ShowHostnames {#ShowHostnames}
Expose backend server host names through the API and various HTML comments

# OverrideHostname {#OverrideHostname}
Override server hostname detection with a hardcoded value.

Should be a string, default false.
@since 1.20

# DevelopmentWarnings {#DevelopmentWarnings}
If set to true MediaWiki will throw notices for some possible error
conditions and for deprecated functions.

# DeprecationReleaseLimit {#DeprecationReleaseLimit}
Release limitation to wfDeprecated warnings, if set to a release number
development warnings will not be generated for deprecations added in releases
after the limit.

# Profiler {#Profiler}
Profiler configuration.

To use a profiler, set $wgProfiler in LocalSettings.php.

Options:

- 'class' (`string`): The Profiler subclass to use.
  Default: ProfilerStub.
- 'sampling' (`integer`): Only enable the profiler on one in this many requests.
  For requests that are not in the sampling,
  the 'class' option will be replaced with ProfilerStub.
  Default: `1`.
- 'threshold' (`float`): Only process the recorded data if the total ellapsed
  time for a request is more than this number of seconds.
  Default: `0.0`.
- 'output' (`string|string[]`):  ProfilerOutput subclass or subclasess to use.
  Default: `[]`.

The options array is passed in its entirety to the specified
Profiler `class`. Check individual Profiler subclasses for additional
options that may be available.

Profiler subclasses available in MediaWiki core:

- ProfilerXhprof: Based on XHProf or Tideways.
- ProfilerExcimer: Based on Excimer.
- ProfilerSectionOnly

Profiler output classes available in MediaWiki:

- ProfilerOutputText: outputs profiling data in the web page body as
  a comment.  You can make the profiling data in HTML render visibly
  instead by setting the 'visible' configuration flag.

- ProfilerOutputStats: outputs profiling data as StatsD metrics.
  It expects that $wgStatsdServer is set to the host (or host:port)
  of a statsd server.

- ProfilerOutputDump: outputs dump files that are compatible
  with the XHProf gui. It expects that `$wgProfiler['outputDir']`
  is set as well.

Examples:

```
$wgProfiler = [
  'class' => ProfilerXhprof::class,
  'output' => ProfilerOutputText::class,
];
```

```
$wgProfiler = [
  'class' => ProfilerXhprof::class,
  'output' => [ ProfilerOutputText::class ],
  'sampling' => 50, // one in every 50 requests
];
```

For performance, the profiler is always disabled for CLI scripts as they
could be long running and the data would accumulate. Use the `--profiler`
parameter of maintenance scripts to override this.
@since 1.17.0

# StatsdServer {#StatsdServer}
Destination of statsd metrics.

A host or host:port of a statsd server. Port defaults to 8125.

If not set, statsd metrics will not be collected.
@see MediaWiki::emitBufferedStatsdData()
@since 1.25

# StatsdMetricPrefix {#StatsdMetricPrefix}
Prefix for metric names sent to $wgStatsdServer.
@see MediaWikiServices::getInstance()->getStatsdDataFactory
@see \BufferingStatsdDataFactory
@since 1.25

# StatsdSamplingRates {#StatsdSamplingRates}
Sampling rate for statsd metrics as an associative array of patterns and rates.

Patterns are Unix shell patterns (e.g. 'MediaWiki.api.*').
Rates are sampling probabilities (e.g. 0.1 means 1 in 10 events are sampled).
@since 1.28

# MetricsTarget {#MetricsTarget}
Metrics output target URI e.g. udp://127.0.0.1:8125

If null, metrics will not be sent.
Note: this only affects metrics instantiated by the MetricsFactory service
@since 1.38

# MetricsFormat {#MetricsFormat}
Metrics output format

If null, metrics will not be rendered nor sent.
Note: this only affects metrics instantiated by the MetricsFactory service
@see \Wikimedia\Metrics\MetricsFactory::SUPPORTED_OUTPUT_FORMATS
@since 1.38

# MetricsPrefix {#MetricsPrefix}
Metrics service name prefix

Required.  Must not be zero-length.
Defaults to: 'mediawiki'
Note: this only affects metrics instantiated by the MetricsFactory service
@since 1.38

# PageInfoTransclusionLimit {#PageInfoTransclusionLimit}
InfoAction retrieves a list of transclusion links (both to and from).

This number puts a limit on that query in the case of highly transcluded
templates.

# ParserTestFiles {#ParserTestFiles}
Parser test suite files to be run by parserTests.php when no specific
filename is passed to it.

Extensions using extension.json will have any *.txt file in a
tests/parser/ directory automatically run.

Core tests can be added to ParserTestRunner::$coreTestFiles.

Use full paths.
@deprecated since 1.30

# EnableJavaScriptTest {#EnableJavaScriptTest}
Allow running of javascript test suites via [[Special:JavaScriptTest]] (such as QUnit).

# CachePrefix {#CachePrefix}
Overwrite the caching key prefix with custom value.
@since 1.19

# DebugToolbar {#DebugToolbar}
Display the new debugging toolbar. This also enables profiling on database
queries and other useful output.

Will be ignored if $wgUseFileCache or $wgUseCdn is enabled.
@since 1.19

# DisableTextSearch {#DisableTextSearch}
Set this to true to disable the full text search feature.

# AdvancedSearchHighlighting {#AdvancedSearchHighlighting}
Set to true to have nicer highlighted text in search results,
by default off due to execution overhead

# SearchHighlightBoundaries {#SearchHighlightBoundaries}
Regexp to match word boundaries, defaults for non-CJK languages
should be empty for CJK since the words are not separate

# OpenSearchTemplate {#OpenSearchTemplate}
Template for OpenSearch suggestions, defaults to API action=opensearch

Sites with heavy load would typically have these point to a custom
PHP wrapper to avoid firing up mediawiki for every keystroke

Placeholders: {searchTerms}
@deprecated since 1.25 Use $wgOpenSearchTemplates['application/x-suggestions+json'] instead

# OpenSearchTemplates {#OpenSearchTemplates}
Templates for OpenSearch suggestions, defaults to API action=opensearch

Sites with heavy load would typically have these point to a custom
PHP wrapper to avoid firing up mediawiki for every keystroke

Placeholders: {searchTerms}

# EnableOpenSearchSuggest {#EnableOpenSearchSuggest}
This was previously a used to force empty responses from ApiOpenSearch
with the 'suggest' parameter set.
@deprecated since 1.35 No longer used

# OpenSearchDefaultLimit {#OpenSearchDefaultLimit}
Integer defining default number of entries to show on
OpenSearch call.

# OpenSearchDescriptionLength {#OpenSearchDescriptionLength}
Minimum length of extract in <Description>. Actual extracts will last until the end of sentence.

# SearchSuggestCacheExpiry {#SearchSuggestCacheExpiry}
Expiry time for search suggestion responses

# DisableSearchUpdate {#DisableSearchUpdate}
If you've disabled search semi-permanently, this also disables updates to the
table. If you ever re-enable, be sure to rebuild the search table.

# NamespacesToBeSearchedDefault {#NamespacesToBeSearchedDefault}
List of namespaces which are searched by default.

**Example:**

```
$wgNamespacesToBeSearchedDefault[NS_MAIN] = true;
$wgNamespacesToBeSearchedDefault[NS_PROJECT] = true;
```

# DisableInternalSearch {#DisableInternalSearch}
Disable the internal MySQL-based search, to allow it to be
implemented by an extension instead.

# SearchForwardUrl {#SearchForwardUrl}
Set this to a URL to forward search requests to some external location.

If the URL includes '$1', this will be replaced with the URL-encoded
search term. Before using this, $wgDisableTextSearch must be set to true.

**Example:**
To forward to Google you'd have something like:

```
$wgSearchForwardUrl =
'https://www.google.com/search?q=$1' .
'&domains=https://example.com' .
'&sitesearch=https://example.com' .
'&ie=utf-8&oe=utf-8';
```

# SitemapNamespaces {#SitemapNamespaces}
Array of namespaces to generate a Google sitemap for when the
maintenance/generateSitemap.php script is run, or false if one is to be
generated for all namespaces.

# SitemapNamespacesPriorities {#SitemapNamespacesPriorities}
Custom namespace priorities for sitemaps. Setting this will allow you to
set custom priorities to namespaces when sitemaps are generated using the
maintenance/generateSitemap.php script.

This should be a map of namespace IDs to priority

**Example:**

```
$wgSitemapNamespacesPriorities = [
    NS_USER => '0.9',
    NS_HELP => '0.0',
];
```

# EnableSearchContributorsByIP {#EnableSearchContributorsByIP}
If true, searches for IP addresses will be redirected to that IP's
contributions page. E.g. searching for "1.2.3.4" will redirect to
[[Special:Contributions/1.2.3.4]]

# SpecialSearchFormOptions {#SpecialSearchFormOptions}
Options for Special:Search completion widget form created by SearchFormWidget class.

Settings that can be used:
- showDescriptions: true/false - whether to show opensearch description results
- performSearchOnClick:  true/false - whether to perform search on click
See also TitleWidget.js UI widget.
@since 1.34

# SearchMatchRedirectPreference {#SearchMatchRedirectPreference}
Set true to allow logged-in users to set a preference whether or not matches in
search results should force redirection to that page. If false, the preference is
not exposed and cannot be altered from site default. To change your site's default
preference, set via $wgDefaultUserOptions['search-match-redirect'].
@since 1.35

# SearchRunSuggestedQuery {#SearchRunSuggestedQuery}
Controls whether zero-result search queries with suggestions should display results for
these suggestions.
@since 1.26

# Diff3 {#Diff3}
Path to the GNU diff3 utility. If the file doesn't exist, edit conflicts will
fall back to the old behavior (no merging).

# Diff {#Diff}
Path to the GNU diff utility.

# PreviewOnOpenNamespaces {#PreviewOnOpenNamespaces}
Which namespaces have special treatment where they should be preview-on-open
Internally only Category: pages apply, but using this extensions (e.g. Semantic MediaWiki)
can specify namespaces of pages they have special treatment for

# UniversalEditButton {#UniversalEditButton}
Enable the UniversalEditButton for browsers that support it
(currently only Firefox with an extension)
See http://universaleditbutton.org for more background information

# UseAutomaticEditSummaries {#UseAutomaticEditSummaries}
If user doesn't specify any edit summary when making a an edit, MediaWiki
will try to automatically create one. This feature can be disabled by set-
ting this variable false.

# CommandLineMode {#CommandLineMode}


# CommandLineDarkBg {#CommandLineDarkBg}
For colorized maintenance script output, is your terminal background dark ?

# ReadOnly {#ReadOnly}
Set this to a string to put the wiki into read-only mode. The text will be
used as an explanation to users.

This prevents most write operations via the web interface. Cache updates may
still be possible. To prevent database writes completely, use the read_only
option in MySQL.

# ReadOnlyWatchedItemStore {#ReadOnlyWatchedItemStore}
Set this to true to put the wiki watchlists into read-only mode.
@since 1.31

# ReadOnlyFile {#ReadOnlyFile}
If this lock file exists (size > 0), the wiki will be forced into read-only mode.

Its contents will be shown to users as part of the read-only warning
message.

Will default to "{$wgUploadDirectory}/lock_yBgMBwiR" in Setup.php

# UpgradeKey {#UpgradeKey}
When you run the web-based upgrade utility, it will tell you what to set
this to in order to authorize the upgrade process. It will subsequently be
used as a password, to authorize further upgrades.

For security, do not set this to a guessable string. Use the value supplied
by the install/upgrade process. To cause the upgrader to generate a new key,
delete the old key from LocalSettings.php.

# GitBin {#GitBin}
Fully specified path to git binary

# GitRepositoryViewers {#GitRepositoryViewers}
Map GIT repository URLs to viewer URLs to provide links in Special:Version

Key is a pattern passed to preg_match() and preg_replace(),
without the delimiters (which are #) and must match the whole URL.
The value is the replacement for the key (it can contain $1, etc.)
%h will be replaced by the short SHA-1 (7 first chars) and %H by the
full SHA-1 of the HEAD revision.
%r will be replaced with a URL-encoded version of $1.
%R will be replaced with $1 and no URL-encoding
@since 1.20

# RCMaxAge {#RCMaxAge}
Recentchanges items are periodically purged; entries older than this many
seconds will go.

Default: 90 days = about three months

# WatchersMaxAge {#WatchersMaxAge}
Page watchers inactive for more than this many seconds are considered inactive.

Used mainly by action=info. Default: 180 days = about six months.
@since 1.26

# UnwatchedPageSecret {#UnwatchedPageSecret}
If active watchers (per above) are this number or less, do not disclose it.

Left to 1, prevents unprivileged users from knowing for sure that there are 0.
Set to -1 if you want to always complement watchers count with this info.
@since 1.26

# RCFilterByAge {#RCFilterByAge}
Filter $wgRCLinkDays by $wgRCMaxAge to avoid showing links for numbers
higher than what will be stored. Note that this is disabled by default
because we sometimes do have RC data which is beyond the limit for some
reason, and some users may use the high numbers to display that data which
is still there.

# RCLinkLimits {#RCLinkLimits}
List of Limits options to list in the Special:Recentchanges and
Special:Recentchangeslinked pages.

# RCLinkDays {#RCLinkDays}
List of Days options to list in the Special:Recentchanges and
Special:Recentchangeslinked pages.
@see \ChangesListSpecialPage::getLinkDays

# RCFeeds {#RCFeeds}
Configuration for feeds to which notifications about recent changes will be sent.

The following feed classes are available by default:
- 'UDPRCFeedEngine' - sends recent changes over UDP to the specified server.
- 'RedisPubSubFeedEngine' - send recent changes to Redis.

Only 'class' or 'uri' is required. If 'uri' is set instead of 'class', then
RecentChange::getEngine() is used to determine the class. All options are
passed to the constructor.

Common options:
- 'class' -- The class to use for this feed (must implement RCFeed).
- 'omit_bots' -- Exclude bot edits from the feed. (default: false)
- 'omit_anon' -- Exclude anonymous edits from the feed. (default: false)
- 'omit_user' -- Exclude edits by registered users from the feed. (default: false)
- 'omit_minor' -- Exclude minor edits from the feed. (default: false)
- 'omit_patrolled' -- Exclude patrolled edits from the feed. (default: false)

FormattedRCFeed-specific options:
- 'uri' -- [required] The address to which the messages are sent.
  The uri scheme of this string will be looked up in $wgRCEngines
  to determine which FormattedRCFeed class to use.
- 'formatter' -- [required] The class (implementing RCFeedFormatter) which will
  produce the text to send. This can also be an object of the class.
  Formatters available by default: JSONRCFeedFormatter, XMLRCFeedFormatter,
  IRCColourfulRCFeedFormatter.

IRCColourfulRCFeedFormatter-specific options:
- 'add_interwiki_prefix' -- whether the titles should be prefixed with
  the first entry in the $wgLocalInterwikis array

JSONRCFeedFormatter-specific options:
- 'channel' -- if set, the 'channel' parameter is also set in JSON values.

**Examples:**

```
$wgRCFeeds['example'] = [
    'uri' => 'udp://localhost:1336',
    'formatter' => 'JSONRCFeedFormatter',
    'add_interwiki_prefix' => false,
    'omit_bots' => true,
];
```

```
$wgRCFeeds['example'] = [
    'uri' => 'udp://localhost:1338',
    'formatter' => 'IRCColourfulRCFeedFormatter',
    'add_interwiki_prefix' => false,
    'omit_bots' => true,
];
```

```
$wgRCFeeds['example'] = [
    'class' => ExampleRCFeed::class,
];
```
@since 1.22

# RCEngines {#RCEngines}
Used by RecentChange::getEngine to find the correct engine for a given URI scheme.

Keys are scheme names, values are names of FormattedRCFeed sub classes.
@since 1.22

# RCWatchCategoryMembership {#RCWatchCategoryMembership}
Treat category membership changes as a RecentChange.

Changes are mentioned in RC for page actions as follows:
- creation: pages created with categories are mentioned
- edit: category additions/removals to existing pages are mentioned
- move: nothing is mentioned (unless templates used depend on the title)
- deletion: nothing is mentioned
- undeletion: nothing is mentioned
@since 1.27

# UseRCPatrol {#UseRCPatrol}
Use RC Patrolling to check for vandalism (from recent changes and watchlists)
New pages and new files are included.
@note If you disable all patrolling features, you probably also want to
remove 'patrol' from $wgFilterLogTypes so a show/hide link isn't shown on
Special:Log.

# StructuredChangeFiltersLiveUpdatePollingRate {#StructuredChangeFiltersLiveUpdatePollingRate}
Polling rate, in seconds, used by the 'live update' and 'view newest' features
of the RCFilters app on SpecialRecentChanges and Special:Watchlist.

0 to disable completely.

# UseNPPatrol {#UseNPPatrol}
Use new page patrolling to check new pages on Special:Newpages
@note If you disable all patrolling features, you probably also want to
remove 'patrol' from $wgFilterLogTypes so a show/hide link isn't shown on
Special:Log.

# UseFilePatrol {#UseFilePatrol}
Use file patrolling to check new files on Special:Newfiles
@note If you disable all patrolling features, you probably also want to
remove 'patrol' from $wgFilterLogTypes so a show/hide link isn't shown on
Special:Log.
@since 1.27

# Feed {#Feed}
Provide syndication feeds (RSS, Atom) for, e.g., Recentchanges, Newpages

# FeedLimit {#FeedLimit}
Set maximum number of results to return in syndication feeds (RSS, Atom) for
eg Recentchanges, Newpages.

# FeedCacheTimeout {#FeedCacheTimeout}
_Minimum_ timeout for cached Recentchanges feed, in seconds.

A cached version will continue to be served out even if changes
are made, until this many seconds runs out since the last render.

If set to 0, feed caching is disabled. Use this for debugging only;
feed generation can be pretty slow with diffs.

# FeedDiffCutoff {#FeedDiffCutoff}
When generating Recentchanges RSS/Atom feed, diffs will not be generated for
pages larger than this size.

# OverrideSiteFeed {#OverrideSiteFeed}
Override the site's default RSS/ATOM feed for recentchanges that appears on
every page. Some sites might have a different feed they'd like to promote
instead of the RC feed (maybe like a "Recent New Articles" or "Breaking news" one).

Should be a format as key (either 'rss' or 'atom') and an URL to the feed
as value.

**Example:**
Configure the 'atom' feed to https://example.com/somefeed.xml

```
$wgSiteFeed['atom'] = "https://example.com/somefeed.xml";
```

# FeedClasses {#FeedClasses}
Available feeds objects.

Should probably only be defined when a page is syndicated ie when
$wgOut->isSyndicated() is true.

# AdvertisedFeedTypes {#AdvertisedFeedTypes}
Which feed types should we provide by default?  This can include 'rss',
'atom', neither, or both.

# RCShowWatchingUsers {#RCShowWatchingUsers}
Show watching users in recent changes, watchlist and page history views

# RCShowChangedSize {#RCShowChangedSize}
Show the amount of changed characters in recent changes

# RCChangedSizeThreshold {#RCChangedSizeThreshold}
If the difference between the character counts of the text
before and after the edit is below that value, the value will be
highlighted on the RC page.

# ShowUpdatedMarker {#ShowUpdatedMarker}
Show "Updated (since my last visit)" marker in RC view, watchlist and history
view for watched pages with new changes

# DisableAnonTalk {#DisableAnonTalk}
Disable links to talk pages of anonymous users (IPs) in listings on special
pages like page history, Special:Recentchanges, etc.

# UseTagFilter {#UseTagFilter}
Allow filtering by change tag in recentchanges, history, etc
Has no effect if no tags are defined.

# SoftwareTags {#SoftwareTags}
List of core tags to enable.
@since 1.31
@since 1.36 Added 'mw-manual-revert' and 'mw-reverted'
@see \ChangeTags::TAG_CONTENT_MODEL_CHANGE
@see \ChangeTags::TAG_NEW_REDIRECT
@see \ChangeTags::TAG_REMOVED_REDIRECT
@see \ChangeTags::TAG_CHANGED_REDIRECT_TARGET
@see \ChangeTags::TAG_BLANK
@see \ChangeTags::TAG_REPLACE
@see \ChangeTags::TAG_ROLLBACK
@see \ChangeTags::TAG_UNDO
@see \ChangeTags::TAG_MANUAL_REVERT
@see \ChangeTags::TAG_REVERTED
@see \ChangeTags::TAG_SERVER_SIDE_UPLOAD

# UnwatchedPageThreshold {#UnwatchedPageThreshold}
If set to an integer, pages that are watched by this many users or more
will not require the unwatchedpages permission to view the number of
watchers.
@since 1.21

# RecentChangesFlags {#RecentChangesFlags}
Flags (letter symbols) shown in recent changes and watchlist to indicate
certain types of edits.

To register a new one:

```
$wgRecentChangesFlags['flag'] => [
  // message for the letter displayed next to rows on changes lists
  'letter' => 'letter-msg',
  // message for the tooltip of the letter
  'title' => 'tooltip-msg',
  // optional (defaults to 'tooltip-msg'), message to use in the legend box
  'legend' => 'legend-msg',
  // optional (defaults to 'flag'), CSS class to put on changes lists rows
  'class' => 'css-class',
  // optional (defaults to 'any'), how top-level flag is determined.  'any'
  // will set the top-level flag if any line contains the flag, 'all' will
  // only be set if all lines contain the flag.
  'grouping' => 'any',
];
```
@since 1.22

# WatchlistExpiry {#WatchlistExpiry}
Whether to enable the watchlist expiry feature.
@since 1.35

# WatchlistPurgeRate {#WatchlistPurgeRate}
Chance of expired watchlist items being purged on any page edit.

Only has effect if $wgWatchlistExpiry is true.

If this is zero, expired watchlist items will not be removed
and the purgeExpiredWatchlistItems.php maintenance script should be run periodically.
@since 1.35

# WatchlistExpiryMaxDuration {#WatchlistExpiryMaxDuration}
Relative maximum duration for watchlist expiries, as accepted by strtotime().

This relates to finite watchlist expiries only. Pages can be watched indefinitely
regardless of what this is set to.

This is used to ensure the watchlist_expiry table doesn't grow to be too big.

Only has effect if $wgWatchlistExpiry is true.

Set to null to allow expiries of any duration.
@since 1.35

# RightsPage {#RightsPage}
Override for copyright metadata.

This is the name of the page containing information about the wiki's copyright status,
which will be added as a link in the footer if it is specified. It overrides
$wgRightsUrl if both are specified.

# RightsUrl {#RightsUrl}
Set this to specify an external URL containing details about the content license used on your
wiki.

If $wgRightsPage is set then this setting is ignored.

# RightsText {#RightsText}
If either $wgRightsUrl or $wgRightsPage is specified then this variable gives the text for the
link. Otherwise, it will be treated as raw HTML.

If using $wgRightsUrl then this value must be specified. If using $wgRightsPage then the name
of the page will also be used as the link text if this variable is not set.

# RightsIcon {#RightsIcon}
Override for copyright metadata.

# UseCopyrightUpload {#UseCopyrightUpload}
Set this to true if you want detailed copyright information forms on Upload.

# MaxCredits {#MaxCredits}
Set this to the number of authors that you want to be credited below an
article text. Set it to zero to hide the attribution block, and a negative
number (like -1) to show all authors. Note that this will require 2-3 extra
database hits, which can have a not insignificant impact on performance for
large wikis.

# ShowCreditsIfMax {#ShowCreditsIfMax}
If there are more than $wgMaxCredits authors, show $wgMaxCredits of them.

Otherwise, link to a separate credits page.

# ImportSources {#ImportSources}
List of interwiki prefixes for wikis we'll accept as sources for
Special:Import and API action=import. Since complete page history can be
imported, these should be 'trusted'.

This can either be a regular array, or an associative map specifying
subprojects on the interwiki map of the target wiki, or a mix of the two,
e.g.

```
$wgImportSources = [
    'wikipedia' => [ 'cs', 'en', 'fr', 'zh' ],
    'wikispecies',
    'wikia' => [ 'animanga', 'brickipedia', 'desserts' ],
];
```

If you have a very complex import sources setup, you can lazy-load it using
the ImportSources hook.

If a user has the 'import' permission but not the 'importupload' permission,
they will only be able to run imports through this transwiki interface.

# ImportTargetNamespace {#ImportTargetNamespace}
Optional default target namespace for interwiki imports.

Can use this to create an incoming "transwiki"-style queue.
Set to numeric key, not the name.

Users may override this in the Special:Import dialog.

# ExportAllowHistory {#ExportAllowHistory}
If set to false, disables the full-history option on Special:Export.

This is currently poorly optimized for long edit histories, so is
disabled on Wikimedia's sites.

# ExportMaxHistory {#ExportMaxHistory}
If set nonzero, Special:Export requests for history of pages with
more revisions than this will be rejected. On some big sites things
could get bogged down by very very long pages.

# ExportAllowListContributors {#ExportAllowListContributors}
Return distinct author list (when not returning full history)

# ExportMaxLinkDepth {#ExportMaxLinkDepth}
If non-zero, Special:Export accepts a "pagelink-depth" parameter
up to this specified level, which will cause it to include all
pages linked to from the pages you specify. Since this number
can become *really really large* and could easily break your wiki,
it's disabled by default for now.
@warning There's a HARD CODED limit of 5 levels of recursion to prevent a
crazy-big export from being done by someone setting the depth number too
high. In other words, last resort safety net.

# ExportFromNamespaces {#ExportFromNamespaces}
Whether to allow the "export all pages in namespace" option

# ExportAllowAll {#ExportAllowAll}
Whether to allow exporting the entire wiki into a single file

# ExportPagelistLimit {#ExportPagelistLimit}
Maximum number of pages returned by the GetPagesFromCategory and
GetPagesFromNamespace functions.
@since 1.27

# XmlDumpSchemaVersion {#XmlDumpSchemaVersion}
The schema to use per default when generating XML dumps. This allows sites to control
explicitly when to make breaking changes to their export and dump format.

# WikiFarmSettingsDirectory {#WikiFarmSettingsDirectory}
EXPERIMENTAL: A directory that contains site-specific
configuration files. Setting this will enable multi-tenant ("wiki farm")
mode, causing site-specific settings to be loaded based on information from
the web request.
@unstable
@since 1.38

# WikiFarmSettingsExtension {#WikiFarmSettingsExtension}
EXPERIMENTAL: The file extension to be used when looking up
site-specific settings files in $wgWikiFarmSettingsDirectory, such as 'json'
or 'yaml'.
@unstable
@since 1.38

# WikiFarmSiteDetector {#WikiFarmSiteDetector}
EXPERIMENTAL: Callback to use to determine the name of the requested site for the
current request. Per default, a method built into WikiFarmSettingsLoader is used,
which will try to determine the wiki name based on the WIKI_NAME environment
variable (if set), or the requested (virtual) host.
Must return a string or null. The return value is used together with the
WikiFarmSettingsDirectory and WikiFarmSettingsExtension to construct the path of
the settings file that holds site specific configuration for the requested site.
Note that the global $wgRequest is not yet available when this callback is called.
@unstable
@since 1.38

# ExtensionFunctions {#ExtensionFunctions}
A list of callback functions which are called once MediaWiki is fully
initialised

# ExtensionMessagesFiles {#ExtensionMessagesFiles}
Extension messages files.

Associative array mapping extension name to the filename where messages can be
found. The file should contain variable assignments. Any of the variables
present in languages/messages/MessagesEn.php may be defined, but $messages
is the most common.

Variables defined in extensions will override conflicting variables defined
in the core.

Since MediaWiki 1.23, use of this variable to define messages is discouraged; instead, store
messages in JSON format and use $wgMessagesDirs. For setting other variables than
$messages, $wgExtensionMessagesFiles should still be used. Use a DIFFERENT key because
any entry having a key that also exists in $wgMessagesDirs will be ignored.

Extensions using the JSON message format can preserve backward compatibility with
earlier versions of MediaWiki by using a compatibility shim, such as one generated
by the generateJsonI18n.php maintenance script, listing it under the SAME key
as for the $wgMessagesDirs entry.

**Example:**

```
$wgExtensionMessagesFiles['ConfirmEdit'] = __DIR__.'/ConfirmEdit.i18n.php';
```

# MessagesDirs {#MessagesDirs}
Extension messages directories.

Associative array mapping extension name to the path of the directory where message files can
be found. The message files are expected to be JSON files named for their language code, e.g.
en.json, de.json, etc. Extensions with messages in multiple places may specify an array of
message directories.

Message directories in core should be added to LocalisationCache::getMessagesDirs()

**Simple example:**

```
$wgMessagesDirs['Example'] = __DIR__ . '/i18n';
```

**Complex example:**

```
$wgMessagesDirs['Example'] = [
    __DIR__ . '/lib/ve/i18n',
    __DIR__ . '/lib/ooui/i18n',
    __DIR__ . '/i18n',
]
```
@since 1.23

# ExtensionEntryPointListFiles {#ExtensionEntryPointListFiles}
Array of files with list(s) of extension entry points to be used in
maintenance/mergeMessageFileList.php
@since 1.22

# ParserOutputHooks {#ParserOutputHooks}
Parser output hooks.

This is an associative array where the key is an extension-defined tag
(typically the extension name), and the value is a PHP callback.
These will be called as an OutputPageParserOutput hook, if the relevant
tag has been registered with the parser output object.

Registration is done with $pout->addOutputHook( $tag, $data ).

The callback has the form:

```
function outputHook( $outputPage, $parserOutput, $data ) { ... }
```

# EnableParserLimitReporting {#EnableParserLimitReporting}
Whether to include the NewPP limit report as a HTML comment

# ValidSkinNames {#ValidSkinNames}
List of valid skin names

The key should be the name in all lower case.

As of 1.35, the value should be a an array in the form of the ObjectFactory specification.

For example for 'foobarskin' where the PHP class is 'MediaWiki\Skins\FooBar\FooBarSkin' set:

**skin.json Example:**

```
"ValidSkinNames": {
	"foobarskin": {
		"displayname": "FooBarSkin",
		"class": "MediaWiki\\Skins\\FooBar\\FooBarSkin"
	}
}
```

Historically, the value was a properly cased name for the skin (and is still currently
supported). This value will be prefixed with "Skin" to create the class name of the
skin to load. Use Skin::getSkinNames() as an accessor if you wish to have access to the
full list.

# SpecialPages {#SpecialPages}
Special page list. This is an associative array mapping the (canonical) names of
special pages to either a class name to be instantiated, or a callback to use for
creating the special page object. In both cases, the result must be an instance of
SpecialPage.

# AutoloadAttemptLowercase {#AutoloadAttemptLowercase}
Switch controlling legacy case-insensitive classloading.

Do not disable if your wiki must support data created by PHP4, or by
MediaWiki 1.4 or earlier.
@deprecated since 1.35

# ExtensionCredits {#ExtensionCredits}
Add information about an installed extension, keyed by its type.

This is for use from LocalSettings.php and legacy PHP-entrypoint
extensions. In general, extensions should (only) declare this
information in their extension.json file.

The 'name', 'path' and 'author' keys are required.

```
$wgExtensionCredits['other'][] = [
    'path' => __FILE__,
    'name' => 'Example extension',
    'namemsg' => 'exampleextension-name',
    'author' => [
        'Foo Barstein',
    ],
    'version' => '0.0.1',
    'url' => 'https://example.org/example-extension/',
    'descriptionmsg' => 'exampleextension-desc',
    'license-name' => 'GPL-2.0-or-later',
];
```

The extensions are listed on Special:Version. This page also looks for a file
named COPYING or LICENSE (optional .txt extension) and provides a link to
view said file. When the 'license-name' key is specified, this file is
interpreted as wikitext.

- $type: One of 'specialpage', 'parserhook', 'variable', 'media', 'antispam',
   'skin', 'api', or 'other', or any additional types as specified through the
   ExtensionTypes hook as used in SpecialVersion::getExtensionTypes().

- name: Name of extension as an inline string instead of localizable message.
   Do not omit this even if 'namemsg' is provided, as it is used to override
   the path Special:Version uses to find extension's license info, and is
   required for backwards-compatibility with MediaWiki 1.23 and older.

- namemsg (since MW 1.24): A message key for a message containing the
   extension's name, if the name is localizable. (For example, skin names
   usually are.)

- author: A string or an array of strings. Authors can be linked using
   the regular wikitext link syntax. To have an internationalized version of
   "and others" show, add an element "...". This element can also be linked,
   for instance "[https://example ...]".

- descriptionmsg: A message key or an array with message key and parameters:
   `'descriptionmsg' => 'exampleextension-desc',`

- description: Description of extension as an inline string instead of
   localizable message (omit in favour of 'descriptionmsg').

- license-name: Short name of the license (used as label for the link), such
  as "GPL-2.0-or-later" or "MIT" (https://spdx.org/licenses/ for a list of identifiers).
@see \SpecialVersion::getCredits

# Hooks {#Hooks}
Global list of hooks.

The key is one of the events made available by MediaWiki, you can find
a description for most of them in their respective hook interfaces. For
overview of the hook system see docs/Hooks.md. The array is used internally
by HookContainer::run().

The value can be one of:

- A function name: `$wgHooks['event_name'][] = $function;`

- A function with some data: `$wgHooks['event_name'][] = [ $function, $data ];`


- A an object method: `$wgHooks['event_name'][] = [ $object, 'method' ];`

- A closure:
```
$wgHooks['event_name'][] = function ( $hookParam ) {
    // Handler code goes here.
};
```

@warning You should always append to an event array or you will end up
deleting a previous registered hook.
@warning Hook handlers should be registered at file scope. Registering
handlers after file scope can lead to unexpected results due to caching.

# ServiceWiringFiles {#ServiceWiringFiles}
List of service wiring files to be loaded by the default instance of MediaWikiServices. Each file listed here is expected to return an associative array mapping service names to instantiator functions. Extensions may add wiring files to define their own services. However, this cannot be used to replace existing services - use the MediaWikiServices hook for that.
@note the default wiring file will be added automatically by Setup.php
@see MediaWikiServices @see ServiceContainer::loadWiringFiles() for details on loading service instantiator functions. @see docs/Injection.md for an overview of dependency injection in MediaWiki.

# JobClasses {#JobClasses}
Maps jobs to their handlers; extensions
can add to this to provide custom jobs.

A job handler should either be a class name to be instantiated,
or (since 1.30) a callback to use for creating the job object.
The callback takes (Title, array map of parameters) as arguments.

# JobTypesExcludedFromDefaultQueue {#JobTypesExcludedFromDefaultQueue}
Jobs that must be explicitly requested, i.e. aren't run by job runners unless
special flags are set. The values here are keys of $wgJobClasses.

These can be:
- Very long-running jobs.
- Jobs that you would never want to run as part of a page rendering request.
- Jobs that you want to run on specialized machines ( like transcoding, or a particular
  machine on your cluster has 'outside' web access you could restrict uploadFromUrl )
These settings should be global to all wikis.

# JobBackoffThrottling {#JobBackoffThrottling}
Map of job types to how many job "work items" should be run per second
on each job runner process. The meaning of "work items" varies per job,
but typically would be something like "pages to update". A single job
may have a variable number of work items, as is the case with batch jobs.

This is used by runJobs.php and not jobs run via $wgJobRunRate.
These settings should be global to all wikis.

# JobSerialCommitThreshold {#JobSerialCommitThreshold}
Make job runners commit changes for replica DB-lag prone jobs one job at a time.

This is useful if there are many job workers that race on replica DB lag checks.
If set, jobs taking this many seconds of DB write time have serialized commits.

Note that affected jobs may have worse lock contention. Also, if they affect
several DBs at once they may have a smaller chance of being atomic due to the
possibility of connection loss while queueing up to commit. Affected jobs may
also fail due to the commit lock acquisition timeout.
@since 1.26

# JobTypeConf {#JobTypeConf}
Map of job types to configuration arrays.

This determines which queue class and storage system is used for each job type.
Job types that do not have explicit configuration will use the 'default' config.
These settings should be global to all wikis.

# JobQueueIncludeInMaxLagFactor {#JobQueueIncludeInMaxLagFactor}
Whether to include the number of jobs that are queued
for the API's maxlag parameter.

The total number of jobs will be divided by this to get an
estimated second of maxlag. Typically bots backoff at maxlag=5,
so setting this to the max number of jobs that should be in your
queue divided by 5 should have the effect of stopping bots once
that limit is hit.
@since 1.29

# SpecialPageCacheUpdates {#SpecialPageCacheUpdates}
Additional functions to be performed with updateSpecialPages.

Expensive Querypages are already updated.

# PagePropLinkInvalidations {#PagePropLinkInvalidations}
Page property link table invalidation lists. When a page property
changes, this may require other link tables to be updated (eg
adding __HIDDENCAT__ means the hiddencat tracking category will
have been added, so the categorylinks table needs to be rebuilt).

This array can be added to by extensions.

# CategoryMagicGallery {#CategoryMagicGallery}
On category pages, show thumbnail gallery for images belonging to that
category instead of listing them as articles.

# CategoryPagingLimit {#CategoryPagingLimit}
Paging limit for categories

# CategoryCollation {#CategoryCollation}
Specify how category names should be sorted, when listed on a category page.

A sorting scheme is also known as a collation.

Available values are:

  - uppercase: Converts the category name to upper case, and sorts by that.

  - identity: Does no conversion. Sorts by binary value of the string.

  - uca-default: Provides access to the Unicode Collation Algorithm with
    the default element table. This is a compromise collation which sorts
    all languages in a mediocre way. However, it is better than "uppercase".

To use the uca-default collation, you must have PHP's intl extension
installed. See https://www.php.net/manual/en/intl.setup.php . The details of the
resulting collation will depend on the version of ICU installed on the
server.

After you change this, you must run maintenance/updateCollation.php to fix
the sort keys in the database.

Extensions can define there own collations by subclassing Collation
and using the Collation::factory hook.

# TempCategoryCollations {#TempCategoryCollations}
Additional category collations to store during LinksUpdate. This can be used
to perform online migration of categories from one collation to another. An
array of associative arrays each having the following keys:

- table: (string) The table name
- collation: (string) The collation to use for cl_sortkey
- fakeCollation: (string) The collation name to insert into cl_collation

@since 1.38

# TrackingCategories {#TrackingCategories}
Array holding default tracking category names.

Array contains the system messages for each tracking category.
Tracking categories allow pages with certain characteristics to be tracked.
It works by adding any such page to a category automatically.

A message with the suffix '-desc' should be added as a description message
to have extra information on Special:TrackingCategories.
@deprecated since 1.25 Extensions should now register tracking categories using
the new extension registration system.
@since 1.23

# LogTypes {#LogTypes}
The logging system has two levels: an event type, which describes the
general category and can be viewed as a named subset of all logs; and
an action, which is a specific kind of event that can exist in that
log type.

Note that code should call LogPage::validTypes() to get a list of valid
log types instead of checking the global variable.

# LogRestrictions {#LogRestrictions}
This restricts log access to those who have a certain right
Users without this will not see it in the option menu and can not view it
Restricted logs are not added to recent changes
Logs should remain non-transcludable
Format: logtype => permissiontype

# FilterLogTypes {#FilterLogTypes}
Show/hide links on Special:Log will be shown for these log types.

This is associative array of log type => boolean "hide by default"

See $wgLogTypes for a list of available log types.

**Example:**

`$wgFilterLogTypes = [ 'move' => true, 'import' => false ];`

Will display show/hide links for the move and import logs. Move logs will be
hidden by default unless the link is clicked. Import logs will be shown by
default, and hidden when the link is clicked.

A message of the form logeventslist-[type]-log should be added, and will be
used for the link text.

# LogNames {#LogNames}
Lists the message key string for each log type. The localized messages
will be listed in the user interface.

Extensions with custom log types may add to this array.
@since 1.19, if you follow the naming convention log-name-TYPE,
where TYPE is your log type, you don't need to use this array.

# LogHeaders {#LogHeaders}
Lists the message key string for descriptive text to be shown at the
top of each log type.

Extensions with custom log types may add to this array.
@since 1.19, if you follow the naming convention log-description-TYPE,
where TYPE is your log type, yoy don't need to use this array.

# LogActions {#LogActions}
Maps log actions to message keys, for formatting log entries of each type
and action when displaying logs to the user.
The array keys are composed as "$type/$action".
Extensions with custom log types may add to this array.

# LogActionsHandlers {#LogActionsHandlers}
The same as above, but here values are names of classes,
not messages.
@see \LogPage::actionText
@see \LogFormatter

# ActionFilteredLogs {#ActionFilteredLogs}
List of log types that can be filtered by action types

To each action is associated the list of log_action
subtypes to search for, usually one, but not necessarily so
Extensions may append to this array
@since 1.27

# NewUserLog {#NewUserLog}
Maintain a log of newusers at Special:Log/newusers?

# PageCreationLog {#PageCreationLog}
Maintain a log of page creations at Special:Log/create?
@since 1.32

# AllowSpecialInclusion {#AllowSpecialInclusion}
Allow special page inclusions such as {{Special:Allpages}}

# DisableQueryPageUpdate {#DisableQueryPageUpdate}
Set this to an array of special page names to prevent
maintenance/updateSpecialPages.php from updating those pages.

Mapping each special page name to an run mode like 'periodical' if a cronjob is set up.

# CountCategorizedImagesAsUsed {#CountCategorizedImagesAsUsed}
On Special:Unusedimages, consider images "used", if they are put
into a category. Default (false) is not to count those as used.

# MaxRedirectLinksRetrieved {#MaxRedirectLinksRetrieved}
Maximum number of links to a redirect page listed on
Special:Whatlinkshere/RedirectDestination

# RangeContributionsCIDRLimit {#RangeContributionsCIDRLimit}
Shortest CIDR limits that can be checked in any individual range check
at Special:Contributions.
@since 1.30

# Actions {#Actions}
Map of allowed values for the "title=foo&action=<action>" parameter.
to the corrspeonding handler code.
See ActionFactory for the syntax. Core defaults are in ActionFactory::CORE_ACTIONS,
anything here overrides that.

# DefaultRobotPolicy {#DefaultRobotPolicy}
Default robot policy.  The default policy is to encourage indexing and fol-
lowing of links.  It may be overridden on a per-namespace and/or per-page
basis.

# NamespaceRobotPolicies {#NamespaceRobotPolicies}
Robot policies per namespaces. The default policy is given above, the array
is made of namespace constants as defined in includes/Defines.php.  You can-
not specify a different default policy for NS_SPECIAL: it is always noindex,
nofollow.  This is because a number of special pages (e.g., ListPages) have
many permutations of options that display the same data under redundant
URLs, so search engine spiders risk getting lost in a maze of twisty special
pages, all alike, and never reaching your actual content.

**Example:**

```
$wgNamespaceRobotPolicies = [ NS_TALK => 'noindex' ];
```

# ArticleRobotPolicies {#ArticleRobotPolicies}
Robot policies per article. These override the per-namespace robot policies.

Must be in the form of an array where the key part is a properly canonicalised
text form title and the value is a robot policy.

**Example:**

```
$wgArticleRobotPolicies = [
        'Main Page' => 'noindex,follow',
        'User:Bob' => 'index,follow',
];
```

**Example that DOES NOT WORK because the names are not canonical text**
forms:

```
$wgArticleRobotPolicies = [
  // Underscore, not space!
  'Main_Page' => 'noindex,follow',
  // "Project", not the actual project name!
  'Project:X' => 'index,follow',
  // Needs to be "Abc", not "abc" (unless $wgCapitalLinks is false for that namespace)!
  'abc' => 'noindex,nofollow'
];
```

# ExemptFromUserRobotsControl {#ExemptFromUserRobotsControl}
An array of namespace keys in which the __INDEX__/__NOINDEX__ magic words
will not function, so users can't decide whether pages in that namespace are
indexed by search engines.  If set to null, default to $wgContentNamespaces.

**Example:**

```
$wgExemptFromUserRobotsControl = [ NS_MAIN, NS_TALK, NS_PROJECT ];
```

# DebugAPI {#DebugAPI}
WARNING: SECURITY THREAT - debug use only

Disables many security checks in the API for debugging purposes.
This flag should never be used on the production servers, as it introduces
a number of potential security holes. Even when enabled, the validation
will still be performed, but instead of failing, API will return a warning.
Also, there will always be a warning notifying that this flag is set.
At this point, the flag allows GET requests to go through for modules
requiring POST.
@since 1.21

# APIModules {#APIModules}
API module extensions.

Associative array mapping module name to modules specs;
Each module spec is an associative array containing at least
the 'class' key for the module's class, and optionally a
'factory' key for the factory function to use for the module.

That factory function will be called with two parameters,
the parent module (an instance of ApiBase, usually ApiMain)
and the name the module was registered under. The return
value must be an instance of the class given in the 'class'
field.

For backward compatibility, the module spec may also be a
simple string containing the module's class name. In that
case, the class' constructor will be called with the parent
module and module name as parameters, as described above.

Examples for registering API modules:

```
$wgAPIModules['foo'] = 'ApiFoo';
$wgAPIModules['bar'] = [
  'class' => ApiBar::class,
  'factory' => function( $main, $name ) { ... }
];
$wgAPIModules['xyzzy'] = [
  'class' => ApiXyzzy::class,
  'factory' => [ XyzzyFactory::class, 'newApiModule' ]
];
```
Extension modules may override the core modules.
See ApiMain::MODULES for a list of the core modules.

# APIFormatModules {#APIFormatModules}
API format module extensions.

Associative array mapping format module name to module specs (see $wgAPIModules).
Extension modules may override the core modules.

See ApiMain::FORMATS for a list of the core format modules.

# APIMetaModules {#APIMetaModules}
API Query meta module extensions.

Associative array mapping meta module name to module specs (see $wgAPIModules).
Extension modules may override the core modules.

See ApiQuery::QUERY_META_MODULES for a list of the core meta modules.

# APIPropModules {#APIPropModules}
API Query prop module extensions.

Associative array mapping prop module name to module specs (see $wgAPIModules).
Extension modules may override the core modules.

See ApiQuery::QUERY_PROP_MODULES for a list of the core prop modules.

# APIListModules {#APIListModules}
API Query list module extensions.

Associative array mapping list module name to module specs (see $wgAPIModules).
Extension modules may override the core modules.

See ApiQuery::QUERY_LIST_MODULES for a list of the core list modules.

# APIMaxDBRows {#APIMaxDBRows}
Maximum amount of rows to scan in a DB query in the API
The default value is generally fine

# APIMaxResultSize {#APIMaxResultSize}
The maximum size (in bytes) of an API result.
@warning Do not set this lower than $wgMaxArticleSize*1024

# APIMaxUncachedDiffs {#APIMaxUncachedDiffs}
The maximum number of uncached diffs that can be retrieved in one API
request. Set this to 0 to disable API diffs altogether

# APIMaxLagThreshold {#APIMaxLagThreshold}
Maximum amount of DB lag on a majority of DB replica DBs to tolerate
before forcing bots to retry any write requests via API errors.

This should be lower than the 'max lag' value in $wgLBFactoryConf.

# APIRequestLog {#APIRequestLog}
Log file or URL (TCP or UDP) to log API requests to, or false to disable
API request logging

# APICacheHelpTimeout {#APICacheHelpTimeout}
Set the timeout for the API help text cache. If set to 0, caching disabled

# APIUselessQueryPages {#APIUselessQueryPages}
The ApiQueryQueryPages module should skip pages that are redundant to true
API queries.

# AjaxUploadDestCheck {#AjaxUploadDestCheck}
Enable AJAX check for file overwrite, pre-upload

# AjaxLicensePreview {#AjaxLicensePreview}
Enable previewing licences via AJAX.

# CrossSiteAJAXdomains {#CrossSiteAJAXdomains}
Settings for incoming cross-site AJAX requests:
Newer browsers support cross-site AJAX when the target resource allows requests
from the origin domain by the Access-Control-Allow-Origin header.

This is currently only used by the API (requests to api.php)
$wgCrossSiteAJAXdomains can be set using a wildcard syntax:

- '*' matches any number of characters
- '?' matches any 1 character

**Example:**

```
$wgCrossSiteAJAXdomains = [
    'www.mediawiki.org',
    '*.wikipedia.org',
    '*.wikimedia.org',
    '*.wiktionary.org',
];
```

# CrossSiteAJAXdomainExceptions {#CrossSiteAJAXdomainExceptions}
Domains that should not be allowed to make AJAX requests,
even if they match one of the domains allowed by $wgCrossSiteAJAXdomains
Uses the same syntax as $wgCrossSiteAJAXdomains

# AllowedCorsHeaders {#AllowedCorsHeaders}
List of allowed headers for cross-origin API requests.

# RestAPIAdditionalRouteFiles {#RestAPIAdditionalRouteFiles}
Additional REST API Route files.

A common usage is to enable development/experimental endpoints only on test wikis.

# MaxShellMemory {#MaxShellMemory}
Maximum amount of virtual memory available to shell processes under linux, in KiB.

# MaxShellFileSize {#MaxShellFileSize}
Maximum file size created by shell processes under linux, in KiB
ImageMagick convert for example can be fairly hungry for scratch space

# MaxShellTime {#MaxShellTime}
Maximum CPU time in seconds for shell processes under Linux

# MaxShellWallClockTime {#MaxShellWallClockTime}
Maximum wall clock time (i.e. real time, of the kind the clock on the wall
would measure) in seconds for shell processes under Linux

# ShellCgroup {#ShellCgroup}
Under Linux: a cgroup directory used to constrain memory usage of shell
commands. The directory must be writable by the user which runs MediaWiki.

If specified, this is used instead of ulimit, which is inaccurate, and
causes malloc() to return NULL, which exposes bugs in C applications, making
them segfault or deadlock.

A wrapper script will create a cgroup for each shell command that runs, as
a subgroup of the specified cgroup. If the memory limit is exceeded, the
kernel will send a SIGKILL signal to a process in the subgroup.

**Example:**

```
mkdir -p /sys/fs/cgroup/memory/mediawiki
mkdir -m 0777 /sys/fs/cgroup/memory/mediawiki/job
echo '$wgShellCgroup = "/sys/fs/cgroup/memory/mediawiki/job";' >> LocalSettings.php
```
The reliability of cgroup cleanup can be improved by installing a
notify_on_release script in the root cgroup, see e.g. https://gerrit.wikimedia.org/r/#/c/40784

# PhpCli {#PhpCli}
Executable path of the PHP cli binary. Should be set up on install.

# ShellRestrictionMethod {#ShellRestrictionMethod}
Method to use to restrict shell commands

Supported options:
- 'autodetect': Autodetect if any restriction methods are available
- 'firejail': Use firejail <https://firejail.wordpress.com/>
- false: Don't use any restrictions
@note If using firejail with MediaWiki running in a home directory different
from the webserver user, firejail 0.9.44+ is required.
@since 1.31

# ShellboxUrl {#ShellboxUrl}

@deprecated since 1.37; use $wgShellboxUrls instead

# ShellboxUrls {#ShellboxUrls}
Shell commands can be run on a remote server using Shellbox. To use this
feature, set this to the URLs mapped by the service, and also configure $wgShellboxSecretKey.

You can also disable a certain service by setting it to false or null.

'default' would be the default URL if no URL is defined for that service.

For more information about installing Shellbox, see
https://www.mediawiki.org/wiki/Shellbox
@since 1.37

# ShellboxSecretKey {#ShellboxSecretKey}
The secret key for HMAC verification of Shellbox requests. Set this to
a long random string.
@since 1.36

# HTTPTimeout {#HTTPTimeout}
Timeout for HTTP requests done internally, in seconds.
@since 1.5

# HTTPConnectTimeout {#HTTPConnectTimeout}
Timeout for connections done internally (in seconds).

Only supported if cURL is installed, ignored otherwise.
@since 1.22

# HTTPMaxTimeout {#HTTPMaxTimeout}
The maximum HTTP request timeout in seconds. If any specified or configured
request timeout is larger than this, then this value will be used instead.
Zero is interpreted as "no limit".
@since 1.35

# HTTPMaxConnectTimeout {#HTTPMaxConnectTimeout}
The maximum HTTP connect timeout in seconds. If any specified or configured
connect timeout is larger than this, then this value will be used instead.
Zero is interpreted as "no limit".
@since 1.35

# HTTPImportTimeout {#HTTPImportTimeout}
Timeout for HTTP requests done internally for transwiki imports, in seconds.
@since 1.29

# AsyncHTTPTimeout {#AsyncHTTPTimeout}
Timeout for Asynchronous (background) HTTP requests, in seconds.

# HTTPProxy {#HTTPProxy}
Proxy to use for CURL requests.

# LocalVirtualHosts {#LocalVirtualHosts}
Local virtual hosts.

This lists domains that are configured as virtual hosts on the same machine.
It is expected that each domain can be identified by its hostname alone,
without any ports.

This affects the following:
- MWHttpRequest: If a request is to be made to a domain listed here, or any
  subdomain thereof, then $wgLocalHTTPProxy will be used.
  Command-line scripts are not affected by this setting and will always use
  the proxy if it is configured.
@since 1.25

# LocalHTTPProxy {#LocalHTTPProxy}
Reverse proxy to use for requests to domains in $wgLocalVirtualHosts

When used, any port in the request URL will be dropped. The behavior of
redirects and cookies is dependent upon the reverse proxy actually in use,
as MediaWiki doesn't implement any special handling for them.

If set to false, no reverse proxy will be used for local requests.
@since 1.38

# AllowExternalReqID {#AllowExternalReqID}
Whether to respect/honour the request ID provided by the incoming request
via the `X-Request-Id` header. Set to `true` if the entity sitting in front
of Mediawiki sanitises external requests. Default: `false`.

# JobRunRate {#JobRunRate}
Number of jobs to perform per request. May be less than one in which case
jobs are performed probabalistically. If this is zero, jobs will not be done
during ordinary apache requests. In this case, maintenance/runJobs.php should
be run periodically.

# RunJobsAsync {#RunJobsAsync}
When $wgJobRunRate > 0, try to run jobs asynchronously, spawning a new process
to handle the job execution, instead of blocking the request until the job
execution finishes.
@since 1.23

# UpdateRowsPerJob {#UpdateRowsPerJob}
Number of rows to update per job

# UpdateRowsPerQuery {#UpdateRowsPerQuery}
Number of rows to update per query

# RedirectOnLogin {#RedirectOnLogin}
Allow redirection to another page when a user logs in.

To enable, set to a string like 'Main Page'

# VirtualRestConfig {#VirtualRestConfig}
Global configuration variable for Virtual REST Services.

Use the 'path' key to define automatically mounted services. The value for this
key is a map of path prefixes to service configuration. The latter is an array of:
  - class : the fully qualified class name
  - options : map of arguments to the class constructor
Such services will be available to handle queries under their path from the VRS
singleton, e.g. MediaWikiServices::getInstance()->getVirtualRESTServiceClient();

Auto-mounting example for Parsoid:

$wgVirtualRestConfig['paths']['/parsoid/'] = [
    'class' => ParsoidVirtualRESTService::class,
    'options' => [
        'url' => 'http://localhost:8000',
        'prefix' => 'enwiki',
        'domain' => 'en.wikipedia.org'
    ]
];

Parameters for different services can also be declared inside the 'modules' value,
which is to be treated as an associative array. The parameters in 'global' will be
merged with service-specific ones. The result will then be passed to
VirtualRESTService::__construct() in the module.

Example config for Parsoid:

  $wgVirtualRestConfig['modules']['parsoid'] = [
    'url' => 'http://localhost:8000',
    'prefix' => 'enwiki',
    'domain' => 'en.wikipedia.org',
  ];
@since 1.25

# EventRelayerConfig {#EventRelayerConfig}
Mapping of event channels (or channel categories) to EventRelayer configuration.

By setting up a PubSub system (like Kafka) and enabling a corresponding EventRelayer class
that uses it, MediaWiki can broadcast events to all subscribers. Certain features like WAN
cache purging and CDN cache purging will emit events to this system. Appropriate listers can
subscribe to the channel and take actions based on the events. For example, a local daemon
can run on each CDN cache node and perform local purges based on the URL purge channel events.

Some extensions may want to use "channel categories" so that different channels can also share
the same custom relayer instance (e.g. when it's likely to be overriden). They can use
EventRelayerGroup::getRelayer() based on the category but call notify() on various different
actual channels. One reason for this would be that some system have very different performance
vs durability needs, so one system (e.g. Kafka) may not be suitable for all uses.

The 'default' key is for all channels (or channel categories) without an explicit entry here.
@since 1.27

# Pingback {#Pingback}
Share data about this installation with MediaWiki developers

When set to true, MediaWiki will periodically ping https://www.mediawiki.org/ with basic
data about this MediaWiki instance. This data includes, for example, the type of system,
PHP version, and chosen database backend. The Wikimedia Foundation shares this data with
MediaWiki developers to help guide future development efforts.

For details about what data is sent, see: https://www.mediawiki.org/wiki/Manual:$wgPingback

For the pingback privacy policy, see: https://wikimediafoundation.org/wiki/MediaWiki_Pingback_Privacy_Statement

Aggregate pingback data is available at: https://pingback.wmflabs.org/
@since 1.28

# OriginTrials {#OriginTrials}
Origin Trials tokens.
@since 1.33

# PriorityHints {#PriorityHints}
Enable client-side Priority Hints.
@warning EXPERIMENTAL!
@since 1.33

# PriorityHintsRatio {#PriorityHintsRatio}
Ratio of requests that should get Priority Hints when the feature is enabled.
@warning EXPERIMENTAL!
@since 1.34

# ElementTiming {#ElementTiming}
Enable Element Timing.
@warning EXPERIMENTAL!
@since 1.33

# ReportToExpiry {#ReportToExpiry}
Expiry of the endpoint definition for the Reporting API.
@warning EXPERIMENTAL!
@since 1.34

# ReportToEndpoints {#ReportToEndpoints}
List of endpoints for the Reporting API.
@warning EXPERIMENTAL!
@since 1.34

# FeaturePolicyReportOnly {#FeaturePolicyReportOnly}
List of Feature Policy Reporting types to enable.

Each entry is turned into a Feature-Policy-Report-Only header.
@warning EXPERIMENTAL!
@since 1.34

# SkinsPreferred {#SkinsPreferred}
List of preferred skins to be listed higher in Special:Preferences
@since 1.38
@var array

