mcrypt_enc_get_supported_key_sizes	mcrypt_enc_is_block_algorithm_mode

Mcrypt Functions	Last updated: Mon, 26 Oct 2026

mcrypt_enc_is_block_algorithm

(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

mcrypt_enc_is_block_algorithm — Checks whether the algorithm of the opened mode is a block algorithm

Warning

This function has been DEPRECATED as of PHP 7.1.0 and REMOVED as of PHP 7.2.0. Relying on this function is highly discouraged.

function mcrypt_enc_is_block_algorithm(resource $td): bool

Tells whether the algorithm of the opened mode is a block algorithm.

Returns true if the algorithm is a block algorithm or false if it is a stream one.

mcrypt_enc_get_supported_key_sizes	mcrypt_enc_is_block_algorithm_mode

Mcrypt Functions	Last updated: Mon, 26 Oct 2026