php man page for mcrypt_enc_get_block_size

MCRYPT_ENC_GET_BLOCK_SIZE(3)						 1					      MCRYPT_ENC_GET_BLOCK_SIZE(3)

mcrypt_enc_get_block_size - Returns the blocksize of the opened algorithm

SYNOPSIS
       int mcrypt_enc_get_block_size (resource	$td)

DESCRIPTION
	Gets the blocksize of the opened algorithm.

PARAMETERS
	      o $td
		- The encryption descriptor.

RETURN VALUES
	Returns the block size of the specified algorithm in bytes.

PHP Documentation Group 											      MCRYPT_ENC_GET_BLOCK_SIZE(3)