... PHP 4 >= 4.0.2) mcrypt_encrypt -- Encrypts plaintext with given parameters . string mcrypt_encrypt ( string cipher, string key, string data, string mode [, string iv]) . mcrypt_encrypt() encrypts the data and returns the encrypted data. Cipher is one of the MCRYPT_ciphername constants of the name of the algorithm as string. ... Data is the data that will be encrypted with the given cipher and mode. ... Example 1. mcrypt_encrypt() Example . ... The above example will print out: . ...