微信pc网页扫码授权登录php

一、获取扫码登录授权二维码

html部分

　<div id="login_container"></div>

<script src="http://res.wx.qq.com/connect/zh_CN/htmledition/js/wxLogin.js"></script>

<script>
   var loginUrl = "http://" + window.location.host + "/index.php?route=common/home/weChatLogin";
   //console.log(loginUrl);
   var obj = new WxLogin({
      id: "login_container",//存放二维码框
      appid: "*************",
      scope: "snsapi_login",
      redirect_uri: encodeURIComponent(loginUrl),
      state: Math.ceil(Math.random()*1000),
      style: "black",
      href: ""});
</script>


二、php部分.

class wxlogin
{
    var $appid = "********";
    var $appsecret = "******************";

    //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
        $res = @file_get_contents('test/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/oauth2/access_token?appid=" . $this->appid . "&secret=" . $this->appsecret . "&code=" . $code . "&grant_type=authorization_code";
        $res = $this->http_request($url);
        return json_decode($res, true);
    }

    //获取用户基本信息（OAuth2 授权的 Access Token 获取 未关注用户，Access Token为临时获取）
    public function oauth2_get_user_info($access_token, $openid)
    {
        $url = "https://api.weixin.qq.com/sns/userinfo?access_token=" . $access_token . "&openid=" . $openid . "&lang=zh_CN";
        $res = $this->http_request($url);
        return json_decode($res, true);
    }

    public function http_request($url){
        return file_get_contents($url);
    }
}

//微信扫码登录
public function weChatLogin(){
   $weixin = getModel("wxlogin");
   //$weixin = new class_weixin();
   if (!isset($_GET["code"])){
      $redirect_url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
      $jumpurl = $weixin->qrconnect($redirect_url, "snsapi_login", "123");
      Header("Location: $jumpurl");
   }else{
      //获取token
      $oauth2_info = $weixin->oauth2_access_token($_GET["code"]);

      //获取用户信息
      $userinfo = $weixin->oauth2_get_user_info($oauth2_info['access_token'], $oauth2_info['openid']);

      //参数样式$userinfo用户信息结构
　　　 //array(10) { ["openid"]=> string(28) "oJDSV0lWOjfXE7VXk6C4_QuiUtQY" ["nickname"]=> string(6) "俊哥" ["sex"]=> int(1) ["language"]=> string(5) "zh_CN" ["city"]=> string(6) "成都" ["province"]=> string(6) "四川" ["country"]=> string(6) "中国" ["headimgurl"]=> string(129) "http://thirdwx.qlogo.cn/mmopen/vi_32/JuV6pCO123H8xHXGe7goSW9tFy0PKLL1zSH3uVuJ9QZ9omZeZ8TjfWGdtjtOBLAs82VqriajFecBys0pGjicVBow/132" ["privilege"]=> array(0) { } ["unionid"]=> string(28) "oAnnw0ix6eEYev5w7AUR29VoS-ow" }

   
　　　　//登录成功后跳转
      header("Location:************");
   }
}