(PHP 4 >= 4.0.2, PHP 5)
mcrypt_module_self_test — This function runs a self test on the specified module
This function runs the self test on the algorithm specified.
The algorithm to test.
The optional lib_dir parameter can contain the location where the algorithm module is on the system.
The function returns TRUE if the self test succeeds, or FALSE when it fails.
Example #1 mcrypt_module_self_test() example 以上例程会输出：
<?php
var_dump(mcrypt_module_self_test(MCRYPT_RIJNDAEL_128)) . "
";
var_dump(mcrypt_module_self_test(MCRYPT_BOGUS_CYPHER));
?>
bool(true)
bool(false)