(PHP3 >= 3.0.8, PHP4 )
int mcrypt_get_block_size (int cipher)
int mcrypt_get_block_size
Mcrypt_get_block_size() is used to get the size of a block of the specified cipher.
Mcrypt_get_block_size() takes one argument, the cipher and returns the size in bytes.
See also: mcrypt_get_key_size().