mcrypt_module_self_test This function runs a self test on the specified module &reftitle.description; boolmcrypt_module_self_test stringalgorithm stringlib_dir This function runs the self test on the algorithm specified. &reftitle.parameters; algorithm &mcrypt.parameter.cipher; lib_dir The optional lib_dir parameter can contain the location where the algorithm module is on the system. &reftitle.returnvalues; The function returns &true; if the self test succeeds, or &false; when it fails. &reftitle.examples; ]]> &example.outputs;