(PHP 4, PHP 5)
mcrypt_ofb — Encrypts/decrypts data in OFB mode
$cipher
   , string $key
   , string $data
   , int $mode
   , string $iv
   )$cipher
   , string $key
   , string $data
   , int $mode
   [, string $iv
  ] )
   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
   MCRYPT_ENCRYPT or
   MCRYPT_DECRYPT.
  
This function should not be used anymore, see mcrypt_encrypt() and mcrypt_decrypt() for replacements.
This function was DEPRECATED in PHP 5.5.0, and REMOVED as of PHP 7.0.0.