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# mcrypt_module_self_test

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_module_self_test -- This function runs a self test on the specified module

## Description

bool mcrypt_module_self_test ( string algorithm [, string lib_dir] )

This function runs the self test on the algorithm specified. The optional lib_dir parameter can contain the location of where the algorithm module is on the system.

The function returns `TRUE` if the self test succeeds, or `FALSE` when if fails.

Example 1. mcrypt_module_self_test() example
`<?php var_dump(mcrypt_module_self_test(MCRYPT_RIJNDAEL_128)) . "\n"; var_dump(mcrypt_module_self_test(MCRYPT_BOGUS_CYPHER)); ?>`
The above example will output:
    bool(true)
    bool(false)

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