微信登陆，支付宝登陆已经是很多电子商务型网站建设必备，但整合这些功能也需要技术，虽说官方都给出说明，但还是费神，所以我们整理出傻瓜式源码：

wxopen.class.php 类文件：

<?php

/*
    开发者 http://www.yx10011.com
    CopyRight 2017 All Rights Reserved
 微信开放平台接口SDK
*/

/*
    require_once('weixin.class.php');
    $weixin = new class_weixin();
*/

define('APPID',  "wxd6d37a2f04dxxxxccccc");  //填写开放平台申请的APPID
define('APPSECRET', "07e38b714e45fbda62dcb9794b99f0fb"); //填写对应的APPSECRET
class class_weixin
{
    var $appid = APPID;
    var $appsecret = APPSECRET;

    //构造函数，获取Access Token
    public function __construct($appid = NULL, $appsecret = NULL)
    {
        if($appid && $appsecret){
            $this->appid = $appid;
            $this->appsecret = $appsecret;
        }

  //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('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"];
            $this->expires_time = time();
            file_put_contents('access_token.json', '{"access_token": "'.$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 semantic_search($record)
    {
        $data = urldecode(json_encode($record));
        $url = "https://api.weixin.qq.com/semantic/semproxy/search?access_token=".$this->access_token;
        $res = $this->http_request($url, $data);
        return json_decode($res, true);
    }

    //HTTP请求（支持HTTP/HTTPS，支持GET/POST）
    protected function http_request($url, $data = null)
    {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
        if (!empty($data)){
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }

    //日志记录
    private function logger($log_content)
    {
        if(isset($_SERVER['HTTP_APPNAME'])){   //SAE
            sae_set_display_errors(false);
            sae_debug($log_content);
            sae_set_display_errors(true);
        }else if($_SERVER['REMOTE_ADDR'] != "127.0.0.1"){ //LOCAL
            $max_size = 500000;
            $log_filename = "log.xml";
            if(file_exists($log_filename) and (abs(filesize($log_filename)) > $max_size)){unlink($log_filename);}
            file_put_contents($log_filename, date('Y-m-d H:i:s').$log_content."\r\n", FILE_APPEND);
        }
    }
}

login.php登陆及回调页：

<?php

header("Content-type: text/html; charset=utf-8");
require_once('wxopen.class.php');
$weixin = new class_weixin();
if (!isset($_GET["code"])){
    $redirect_url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    $jumpurl = $weixin->qrconnect($redirect_url, "snsapi_login", "123");
    Header("Location: $jumpurl");
}else{
    $oauth2_info = $weixin->oauth2_access_token($_GET["code"]);
    $userinfo = $weixin->oauth2_get_user_info($oauth2_info['access_token'], $oauth2_info['openid']);
    var_dump($userinfo);
}
wxopen.login.html登陆前台

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="content-type" content="text/html;charset=utf-8">
    </head>
    <body>
        <span id="login_container"></span>
        <script src="http://res.wx.qq.com/connect/zh_CN/htmledition/js/wxLogin.js"></script>
        <script>
            var obj = new WxLogin({
              id: "login_container",
              appid: "wxd6d37a2f04d53de4",
              scope: "snsapi_login",
              redirect_uri: encodeURIComponent("http://" + window.location.host + "/login.php"),
              state: Math.ceil(Math.random()*1000),
              style: "black",
              href: ""});
        </script>
    </body>
</html>