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mcrypt_module_self_test

This function runs a self test on the specified module (PHP 4 >= 4.0.2, PHP 5)
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 1303. 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)