Runtime Configuration

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

Mcrypt configuration options

Name	Default	Changeable	Changelog
mcrypt.algorithms_dir	NULL	PHP_INI_ALL	Available since PHP 4.0.2.
mcrypt.modes_dir	NULL	PHP_INI_ALL	Available since PHP 4.0.2.

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