微信view类型的菜单获取openid范例

 <?php
 //启用session
 session_start();
 //编码
 header("Content-type: text/html; charset=utf-8");
 //保存微信openid
 $weixin_openid = "";
 //保存从微信得到的code
 $code = "";
 //获得菜单中设置的state值
 $state = "";

 //修改为注册的测试号信息
 $appid = "wx834404c1d1dbb5ec";
 $secret = "bf03cfa823d80dd537bd18e83ce9a4e4";

 if (isset($_GET['code']) && isset($_GET['state']) ){
     $weixin_openid = GetOpenid($_GET['code']);
     $code = $_GET['code'];
     $state = $_GET['state'];
     //echo $resultStr;
 }else{
     echo "NO CODE";
     return ;
 }

 // store session data
 $_SESSION['weixin_openid']=$weixin_openid;

 if($state == "s1"){
     //我的课堂
     header('Location: courseCenter.php');
 }else if($state == "s2"){
     //订单记录
     header('Location: orderList.php');
 }else{
     $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/>
     <a href='orderList.php'>订单记录</a>";
     $resultStr = sprintf($textTpl, $weixin_openid, $code, $state);

     echo  $resultStr ;
 }

 //获取微信的openid
 function GetOpenid($c_code)
 {
     $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" . $appid . "&secret=" . $secret . "&code=" . $c_code .  "&grant_type=authorization_code";
     //$url = "http://www.baidu.com";
     $result = getData($url);

     $jsondecode = json_decode($result);
     if($jsondecode != null){
         if(property_exists ( $jsondecode, "openid" ) )
         {
             return $jsondecode->{"openid"};
         }else{
             return "code is invalid.";
         }
     }

     return null;
 }
 //获取https的get请求结果
 function getData($c_url)
 {
     $curl = curl_init(); // 启动一个CURL会话
     curl_setopt($curl, CURLOPT_URL, $c_url); // 要访问的地址
     curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0); // 对认证证书来源的检查
     curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 1); // 从证书中检查SSL加密算法是否存在
     curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']); // 模拟用户使用的浏览器
     curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1); // 使用自动跳转
     curl_setopt($curl, CURLOPT_AUTOREFERER, 1); // 自动设置Referer
 //    curl_setopt($curl, CURLOPT_POST, 1); // 发送一个常规的Post请求
 //    curl_setopt($curl, CURLOPT_POSTFIELDS, $data); // Post提交的数据包
     curl_setopt($curl, CURLOPT_TIMEOUT, 30); // 设置超时限制防止死循环
     curl_setopt($curl, CURLOPT_HEADER, 0); // 显示返回的Header区域内容
     curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回
     $tmpInfo = curl_exec($curl); // 执行操作
     if (curl_errno($curl)) {
        echo 'Errno'.curl_error($curl);//捕抓异常
     }
     curl_close($curl); // 关闭CURL会话
     return $tmpInfo; // 返回数据
 }

 ?>