mcrypt_ofb
  Encrypts/decrypts data in OFB mode
  
 
 
  Warning
   
 This function was DEPRECATED in PHP 5.5.0, and
 REMOVED in PHP 7.0.0.
 Alternatives to this function include:
   
    - mcrypt_decrypt
- mcrypt_encrypt
 
  
 
 
  Description
  
   string mcrypt_ofb
    ( int $cipher
   , string $key
   , string $data
   , int $mode
   , string $iv
   )
  
   string mcrypt_ofb
    ( string $cipher
   , string $key
   , string $data
   , int $mode
   [, string $iv
  ] )