mcrypt_module_is_block_algorithm(3) php man page | unix.com

MCRYPT_MODULE_IS_BLOCK_ALGORITHM(3)					 1				       MCRYPT_MODULE_IS_BLOCK_ALGORITHM(3)

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

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

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

PARAMETERS
	      o $algorithm
		- The algorithm to check.

	      o $lib_dir
		- The optional $lib_dir parameter can contain the location where the algorithm module is on the system.

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

PHP Documentation Group 										       MCRYPT_MODULE_IS_BLOCK_ALGORITHM(3)