Md5加密
<p>一、加密</p>
<pre><code> $salt = rand(10000, 99999);
$users->salt = $salt;
$users->payment_password = md5(md5($this->request->payment_password) . $salt);
$users->save();</code></pre>
<p>二、解密</p>
<pre><code>$pwd = md5(md5($request->payment_password) . $capital->salt);
if ($pwd != $capital->payment_password) {
return $this->error('密码不正确');
}</code></pre>