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
Manual

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.