1 <?php
 2 //启用session
 3 session_start();
 4 //编码
 5 header("Content-type: text/html; charset=utf-8");
 6 //保存微信openid
 7 $weixin_openid = "";
 8 //保存从微信得到的code
 9 $code = "";
10 //获得菜单中设置的state值
11 $state = "";
12 
13 //修改为注册的测试号信息
14 $appid = "wx834404c1d1dbb5ec";
15 $secret = "bf03cfa823d80dd537bd18e83ce9a4e4";
16 
17 if (isset($_GET[‘code‘]) && isset($_GET[‘state‘]) ){
18     $weixin_openid = GetOpenid($_GET[‘code‘]);
19     $code = $_GET[‘code‘];
20     $state = $_GET[‘state‘];
21     //echo $resultStr;
22 }else{
23     echo "NO CODE";
24     return ;
25 }
26 
27 // store session data
28 $_SESSION[‘weixin_openid‘]=$weixin_openid;
29 
30 if($state == "s1"){
31     //我的课堂
32     header(‘Location: courseCenter.php‘);
33 }else if($state == "s2"){
34     //订单记录
35     header(‘Location: orderList.php‘);
36 }else{
37     $textTpl="由认证接口进入我的课堂,<br/>您的 wx_openid: %s <br/> code: %s <br/> state: %s <br/>
38     <a href=‘orderList.php‘>订单记录</a>";
39     $resultStr = sprintf($textTpl, $weixin_openid, $code, $state);
40 
41     echo  $resultStr ;
42 }
43 
44 
45 
46 //获取微信的openid
47 function GetOpenid($c_code)
48 {
49     $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" . $appid . "&secret=" . $secret . "&code=" . $c_code .  "&grant_type=authorization_code";
50     //$url = "http://www.baidu.com";
51     $result = getData($url);
52 
53     $jsondecode = json_decode($result);
54     if($jsondecode != null){
55         if(property_exists ( $jsondecode, "openid" ) )
56         {
57             return $jsondecode->{"openid"};
58         }else{
59             return "code is invalid.";
60         }
61     }
62 
63     return null;
64 }
65 //获取https的get请求结果
66 function getData($c_url)
67 {
68     $curl = curl_init(); // 启动一个CURL会话
69     curl_setopt($curl, CURLOPT_URL, $c_url); // 要访问的地址
70     curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0); // 对认证证书来源的检查
71     curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 1); // 从证书中检查SSL加密算法是否存在
72     curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER[‘HTTP_USER_AGENT‘]); // 模拟用户使用的浏览器
73     curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1); // 使用自动跳转
74     curl_setopt($curl, CURLOPT_AUTOREFERER, 1); // 自动设置Referer
75 //    curl_setopt($curl, CURLOPT_POST, 1); // 发送一个常规的Post请求
76 //    curl_setopt($curl, CURLOPT_POSTFIELDS, $data); // Post提交的数据包
77     curl_setopt($curl, CURLOPT_TIMEOUT, 30); // 设置超时限制防止死循环
78     curl_setopt($curl, CURLOPT_HEADER, 0); // 显示返回的Header区域内容
79     curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回
80     $tmpInfo = curl_exec($curl); // 执行操作
81     if (curl_errno($curl)) {
82        echo ‘Errno‘.curl_error($curl);//捕抓异常
83     }
84     curl_close($curl); // 关闭CURL会话
85     return $tmpInfo; // 返回数据
86 }
87 
88 ?>