(PHP 4, PHP 5)
mcrypt_cbc — Encrypts/decrypts data in CBC 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_generic() and mdecrypt_generic() for replacements.