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mcrypt_cfb
Encrypt/decrypt data in CFB mode
(PHP 4, PHP 5)
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.