mcrypt_module_self_test

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

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

Warning

This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.

bool mcrypt_module_self_test ( string $algorithm [, string $lib_dir ] )

This function runs the self test on the algorithm specified.

algorithm: One of the MCRYPT_ciphername constants, or the name of the algorithm as string.
lib_dir: 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

<?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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https://secure.php.net/manual/en/function.mcrypt-module-self-test.php