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<mcrypt_enc_is_block_algorithmmcrypt_enc_is_block_mode>
^Mcrypt FunctionsLast updated: Mon, 26 Oct 2026

mcrypt_enc_is_block_algorithm_mode

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

mcrypt_enc_is_block_algorithm_mode — Checks whether the encryption of the opened mode works on blocks

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.

Description

function mcrypt_enc_is_block_algorithm_mode(resource $td): bool

Tells whether the algorithm of the opened mode works on blocks (e.g. false for stream, and true for cbc, cfb, ofb)..

Parameters

td

The encryption descriptor.

Return Values

Returns true if the mode is for use with block algorithms, otherwise it returns false.


<mcrypt_enc_is_block_algorithmmcrypt_enc_is_block_mode>
^Mcrypt FunctionsLast updated: Mon, 26 Oct 2026