php-微信授权登录

原生php 微信授权登录：

index.php页面：

<?php

session_start();

if($_SESSION['openid']){
exit('已经授权登录过了。。。');

} {
include_once "weixin.class.php";
$wx_login = new Wxlogin();
echo '1';exit;
$userinfo = $wx_login->getUserInfo();

if($userinfo['openid']){

$_SESSION['openid'] = $userinfo['openid'];

var_dump($userinfo);

} else {
exit('授权失败');
}
}