Here is the deprecated warning from PHP Docs for [mcrypt_get_block_size](https://www.php.net/manual/en/function.mcrypt-get-block-size.php) > **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.
Here is the deprecated warning from PHP Docs for mcrypt_get_block_size