php >=5.6 && php <7.0
https://packagist.org/packages/devilhot/mcrypt
composer require devilhot/mcrypt
<?php
include_once "vendor/autoload.php";
use Devil\Mcrypt;
//加密
$s = Mcrypt::encrypt('1232');
var_dump($s);
//解密
$s = Mcrypt::decrypt($s);
var_dump($s);
?>