pc端网站如何实现微信扫码一键登录？

1、先登录微信开放平台，没有账号就申请一个，地址：https://open.weixin.qq.com/

2、点击管理工具-》创建网站应用

3、填写基本信息及网站信息

4、等待审核成功后还要绑定公众号到认证的公众号上。

5、我们来看代码怎么写，我们以php为例

<?php
class wxlogin
{
    var $appid = "sx23213123123123";
    var $appsecret = "123124324esfdsfdsf23434324234";

    //构造函数，获取Access Token
    public function __construct($appid = NULL, $appsecret = NULL) {
        //扫码登录不需要该Access Token, 语义理解需要
        //1. 本地写入,防止token过期
        $res = @file_get_contents('access_token.json');
        $result = json_decode($res, true);
        $this->expires_time = $result["expires_time"];
        $this->access_token = $result["access_token"];

        if (time() > ($this->expires_time + 3600)) {
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $this->appid . "&secret=" . $this->appsecret;
            $res = $this->http_request($url);
            $result = json_decode($res, true);
            $this->access_token = $result["access_token"];
            $this->expires_time = time();
            file_put_contents('test/access_token.json', '{"access_token": "' . $this->access_token . '", "expires_time": ' . $this->expires_time . '}');
        }
    }

    //生成扫码登录的URL,
    public function qrconnect($redirect_url, $scope, $state = NULL) {
        $url = "https://open.weixin.qq.com/connect/qrconnect?appid=" . $this->appid . "&redirect_uri=" . urlencode($redirect_url) . "&response_type=code&scope=" . $scope . "&state=" . $state . "#wechat_redirect";
        return $url;
    }

    //生成OAuth2的Access Token
    public function oauth2_access_token($code) {
        $url = "https://api.weixin.qq.com/sns/oau...

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