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mcrypt_cbc

Encrypt/decrypt data in CBC mode (PHP 4, PHP 5)
string mcrypt_cbc ( int cipher, string key, string data, int mode [, string iv] )
string mcrypt_cbc ( 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.