# mcrypt_module_is_block_algorithm

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_module_is_block_algorithm — This function checks whether the specified algorithm is a block algorithm

### Description

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` is it is a stream algorithm. The optional `lib_dir` parameter can contain the location where the algorithm module is on the system.