(PHP 4, PHP 5)
mcrypt_cfb — Encrypts/decrypts data in CFB mode
The first prototype is when linked against libmcrypt 2.2.x, the
second when linked against libmcrypt 2.4.x or higher. The
mode should be either
This function has been DEPRECATED as of PHP 5.5.0. Relying on this function is highly discouraged.