PHP DES加密函数

两个函数如下：
加密函数：encrypt
function encrypt($encrypt,$key="") {
$iv = mcrypt_create_iv ( mcrypt_get_iv_size ( MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB ), MCRYPT_RAND );
$passcrypt = mcrypt_encrypt ( MCRYPT_RIJNDAEL_256, $key, $encrypt, MCRYPT_MODE_ECB, $iv );
$encode = base64_encode ( $passcrypt );
return $encode;
}

解密函数：decrypt
function decrypt($decrypt,$key="") {
$decoded = base64_decode ( $decrypt );
$iv = mcrypt_create_iv ( mcrypt_get_iv_size ( MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB ), MCRYPT_RAND );
$decrypted = mcrypt_decrypt ( MCRYPT_RIJNDAEL_256, $key, $decoded, MCRYPT_MODE_ECB, $iv );
return $decrypted;
}