mcrypt_get_block_size Get the block size of the specified cipher intmcrypt_get_block_size intcipher intmcrypt_get_block_size stringcipher stringmodule The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x or 2.5.x. mcrypt_get_block_size is used to get the size of a block of the specified cipher (in combination with an encryption mode). It is more useful to use the mcrypt_enc_get_block_size function as this uses the resource returned by mcrypt_module_open. This example shows how to use this function when linked against libmcrypt 2.4.x and 2.5.x. Prints: 8 ]]> See also: mcrypt_get_key_size, mcrypt_enc_get_block_size and mcrypt_encrypt.