Checks if APC key exists

apc_delete
apc_fetch
APC Functions
PHP Manual

# apc_exists

(PECL apc >= 3.1.4)

apc_exists — Checks if APC key exists

### Description

mixed apc_exists ( mixed `$keys` )

Checks if one or more APC keys exist.

### Parameters

`keys`

  A string, or an array of strings, that contain keys.

### Return Values

Returns `TRUE` if the key exists, otherwise `FALSE` Or if an array was passed to `keys`, then an array is returned that contains all existing keys, or an empty array if none exist.

### Examples

Example #1 apc_exists() example

`<?php
$fruit = 'apple';
$veggie = 'carrot';
apc_store('foo', $fruit);
apc_store('bar', $veggie);
if (apc_exists('foo')) {
echo "Foo exists: ";
echo apc_fetch('foo');
} else {
echo "Foo does not exist";
}
echo PHP_EOL;
if (apc_exists('baz')) {
echo "Baz exists.";
} else {
echo "Baz does not exist";
}
echo PHP_EOL;
$ret = apc_exists(array('foo', 'donotexist', 'bar'));
var_dump($ret);
?>`

The above example will output something similar to:

    Foo exists: apple
    Baz does not exist
    array(2) {
      ["foo"]=>
      bool(true)
      ["bar"]=>
      bool(true)
    }

### See Also

- apc_cache_info() - Retrieves cached information from APC's data store
- apc_fetch() - Fetch a stored variable from the cache

apc_delete
apc_fetch
APC Functions
PHP Manual