mcrypt_module_get_algo_block_size

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

mcrypt_module_get_algo_block_size — Returns the blocksize of the specified algorithm

int mcrypt_module_get_algo_block_size ( string $algorithm [, string $lib_dir ] )

Gets the blocksize of the specified algorithm.

algorithm: The algorithm name.
lib_dir: This optional parameter can contain the location where the mode module is on the system.

Returns the block size of the algorithm specified in bytes.