int mcrypt_ecb(int cipher, string key, string data, int mode);mcrypt_ecb() encrypts or decrypts (depending on mode) the data with cipher and key in ECB 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.
See also: mcrypt_cbc(), mcrypt_cfb(), mcrypt_ofb()