Installation
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PHP Manual

## 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_* constants, see the php.ini directives.

Installation
Resource Types
Installing/Configuring
PHP Manual