bool mcrypt_enc_is_block_algorithm_mode(resource $td)
This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.
Tells whether the algorithm of the opened mode works on blocks (e.g.
FALSE for stream, and
TRUE for cbc, cfb, ofb)..
TRUE if the mode is for use with block algorithms, otherwise it returns
- resource $td: The encryption descriptor.