(PHP 4, PHP 5)
mcrypt_cfb — Encrypts/decrypts data in CFB mode
This function was DEPRECATED in PHP 5.5.0, and REMOVED in PHP 7.0.0.
Alternatives to this function include:
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