   #PHP Manual Mcrypt Encryption Functions mcrypt_cbc mcrypt_create_iv

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                                  mcrypt_cfb

   (PHP 3>= 3.0.8, PHP 4 )
   mcrypt_cfb -- Encrypt/decrypt data in CFB mode

Description

   string mcrypt_cfb ( int cipher, string key, string data, int mode,
   string iv)
   string mcrypt_cfb ( string 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_generic() and
   mdecrypt_generic() for replacements.
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