The behaviour of these functions is affected by settings in php.ini.
| Name | Default | Changeable | Changelog | 
|---|---|---|---|
| yaml.decode_binary | 0 | PHP_INI_ALL | |
| yaml.decode_php | 1 | PHP_INI_ALL | |
| yaml.decode_timestamp | 0 | PHP_INI_ALL | |
| yaml.output_canonical | 0 | PHP_INI_ALL | |
| yaml.output_indent | 2 | PHP_INI_ALL | |
| yaml.output_width | 80 | PHP_INI_ALL | 
Here's a short explanation of the configuration directives.
yaml.decode_binary
          boolean
        Off by default, but can be set to on to cause base64 binary encoded entities which have the explicit tag "tag:yaml.org,2002:binary" to be decoded.
yaml.decode_php
          boolean
        On by default, but can be set to off to prevent serialized php objects which have the explicit tag "!php/object" from being unserialized.
yaml.decode_timestamp
          integer
        Controls the decoding of both implicit and explict "tag:yaml.org,2002:timestamp" scalars in the YAML document stream. The default setting of 0 will not apply any decoding. A setting of 1 will use strtotime() to parse the timestamp value as a Unix timestamp. A setting of 2 will use date_create() to parse the timestamp value as DateTime object.
yaml.output_canonical
          boolean
        Off by default, but can be set to on to cause canonical form output.
yaml.output_indent
          integer
        Number of spaces to indent sections. Value should be between 1 and 10.
yaml.output_width
          integer
        Set the preferred line width. -1 means unlimited.