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Runtime Configuration

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

Variables Configuration Options
Name Default Changeable Changelog
unserialize_callback_func null INI_ALL  
unserialize_max_depth "4096" INI_ALL Available as of PHP 7.4.0.
For further details and definitions of the 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 Classes.

unserialize_max_depth int

The maximum depth of structures permitted during unserialization when using unserialize(), and is intended to prevent stack overflows. This can be disabled by setting unserialize_max_depth=0.

See also unserialize() and Autoloading Classes.