mcrypt_get_iv_size

PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0
mcrypt_get_iv_size - Returns the size of the IV belonging to a specific cipher/mode combination
Manual
Code Examples

Example #1 mcrypt_get_iv_size Example

<?php
echo mcrypt_get_iv_size(MCRYPT_CAST_256, MCRYPT_MODE_CFB) . "\n";
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PHP Version: