(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)
mcrypt_module_is_block_algorithm — This function checks whether the specified algorithm is a block algorithm
This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.
$algorithm
[, string $lib_dir
] ) : bool
This function returns TRUE if the specified algorithm is a block
algorithm, or FALSE if it is a stream one.
algorithmThe algorithm to check.
lib_dir
The optional lib_dir parameter can contain the
location where the algorithm module is on the system.
This function returns TRUE if the specified algorithm is a block
algorithm, or FALSE if it is a stream one.