1、首先到微信开放平台申请https://open.weixin.qq.com/ 获取到appid和APPSECRET，前台显示页面如下

html>

var obj = new WxLogin({

id: "login_container",

appid: "wxed782be999f86e0e",

scope: "snsapi_login",

redirect_uri: encodeURIComponent("http://" + window.location.host + "/login.php"),

state: Math.ceil(Math.random()*1000),

style: "black",

href: ""});

2、PHP处理代码页面

/*

require_once('weixin.class.php');

$weixin = new class_weixin();

*/

define('APPID', "wx19ba77624e083e08");

define('APPSECRET', "c1a56a5c4247dd44c320c9719c5ceb90");

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.'}');

}

}

/*

* PART1 网站应用

*/

/*

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);

}

*/

//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);

}

演示下载地址：http://www.erdangjiade.com/php/1034.html