The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x.
Mcrypt_cbc() encrypts or decrypts (depending on mode) the data with cipher and key in CBC cipher mode and returns the resulting string.
Cipher is one of the MCRYPT_ciphername constants.
Key is the key supplied to the algorithm. It must be kept secret.
Data is the data which shall be encrypted/decrypted.
Mode is MCRYPT_ENCRYPT or MCRYPT_DECRYPT.
IV is the optional initialization vector.
See also: mcrypt_cfb(), mcrypt_ecb(), and mcrypt_ofb().
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