(PHP 4, PHP 5)
Encrypts/decrypts data in CFB mode
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.
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