mcrypt_enc_is_block_algorithm_mode
    (PHP 4 >= 4.0.2, PHP 5)
mcrypt_enc_is_block_algorithm_mode -- Checks whether the encryption of the opened mode works on blocks
Description
bool 
mcrypt_enc_is_block_algorithm_mode ( resource td )
     This function returns TRUE if the mode is for use with block algorithms,
     otherwise it returns FALSE. (e.g. FALSE for stream, and TRUE for cbc, cfb, ofb).