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

mcrypt_enc_is_block_mode

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

mcrypt_enc_is_block_mode — Checks whether the opened mode outputs 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_mode(resource $td): bool

Tells whether the opened mode outputs blocks (e.g. true for cbc and ecb, and false for cfb and stream).

Parameters

td

The encryption descriptor.

Return Values

Returns true if the mode outputs blocks of bytes, or false if it outputs just bytes.


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