mcrypt_module_is_block_algorithm

This function checks whether the specified algorithm is a block algorithm

Warning

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

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

This function returns TRUE if the specified algorithm is a block algorithm, or FALSE if it is a stream one.

algorithm: The 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.