Runtime Configuration

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The behaviour of these functions is affected by settings in php.ini.

**Variables Configuration Options**
Name	Default	Changeable	Changelog
unserialize_callback_func	NULL	PHP_INI_ALL	Available since PHP 4.2.0.

For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

unserialize_callback_func string

The callback specified is called when unserialize() attempts to use an undefined class. A warning appears if the specified callback function is not defined, or if the callback function fails to define the missing class.

See also unserialize() and Autoloading Objects.

Runtime Configuration

PHP Manual