php微信网页授权获取用户信息

配置回调域名：

1. 引导用户进入授权页面同意授权，获取code

2. 通过code换取网页授权access_token（与基础支持中的access_token不同）

3. 如果需要，开发者可以刷新网页授权access_token，避免过期

4. 通过网页授权access_token和openid获取用户基本信息

先自己建立两个文件: index.php  和  getUser.php

代码实例

index.php如下:

 <?php
     $appid = "公众号的appid";
     $REDIRECT_URI='回调链接';
     $scope='snsapi_base';
 //  $scope='snsapi_userinfo';//需要授权
     $url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid='.$appid.'&redirect_uri='.urlencode($REDIRECT_URI).'&response_type=code&scope='.$scope.'&state=STATE#wechat_redirect';
     header("Location:".$url);
 ?>  

getUser.php如下:

 <?php
 $appid = "公众号appid";
 $secret = "公众号secret";
 //获取code
 $code = $_GET["code"];
 //获取access_token
 $get_token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$secret.'&code='.$code.'&grant_type=authorization_code';  

 $ch = curl_init();
 curl_setopt($ch,CURLOPT_URL,$get_token_url);
 curl_setopt($ch,CURLOPT_HEADER,0);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
 $res = curl_exec($ch);
 curl_close($ch);
 $json_obj = json_decode($res,true);  

 //根据openid和access_token查询用户信息
 $access_token = $json_obj['access_token'];
 $openid = $json_obj['openid'];
 $get_user_info_url = 'https://api.weixin.qq.com/sns/userinfo?access_token='.$access_token.'&openid='.$openid.'&lang=zh_CN';
 $ch = curl_init();
 curl_setopt($ch,CURLOPT_URL,$get_user_info_url);
 curl_setopt($ch,CURLOPT_HEADER,0);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
 $res = curl_exec($ch);
 curl_close($ch);
 //解析json
 $user_obj = json_decode($res,true);
 $_SESSION['user'] = $user_obj;
 print_r($user_obj);
 ?>