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    function wxlogin()
    {
    
        $appid = "wx8220c76bf8XXXX5";
        $secret = "f6951af54c4e35XXX9912173daXXXXX";
     
        $str="http://***.***.com/getToken";
        $redirect_uri=urlencode($str);
        //通过code获得 access_token + openid
        $url="https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$appid."&redirect_uri=".$redirect_uri."&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";
      
       header("Location:" . $url);
    }

 function getToken()
{
    

    
$code = $_GET["code"];

        $appid = "";
       $secret = "";

//通过code获得 access_token + openid
       $url="https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid
        ."&secret=" . $secret . "&code=" . $code . "&grant_type=authorization_code";
        $jsonResult =$this->https_request($url);
        $resultArray = json_decode($jsonResult, true);

        $access_token = $resultArray["access_token"];
        $openid = $resultArray["openid"];

//第三步  获取用户信息
         //通过access_token + openid 获得用户所有信息,结果全部存储在$infoArray里,后面再写自己的代码逻辑
        $infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=" . $access_token . "&openid=" . $openid.'&lang=zh_CN';
        $infoResult = $this->https_request($infoUrl);
        $infoArray = json_decode($infoResult, true);

       if($infoArray['unionid'])
        {
        
     }

}