php获取微信的openid

 1         header("Content-type: text/html; charset=utf-8");
 2         if(!isset($_GET[\'code\'])){
 3             $APPID=\'公众号在微信的appid\';
 4             $REDIRECT_URI=\'要请求的url\';
 5             $scope=\'snsapi_base\';
 6             $url=\'https://open.weixin.qq.com/connect/oauth2/authorize?appid=\'.$APPID.\'&redirect_uri=\'.urlencode($REDIRECT_URI).\'&response_type=code&scope=\'.$scope.\'&state=wx\'.\'#wechat_redirect\';
 7             header("Location:".$url);
 8         }else{
 9             $appid = "公众号在微信的appid";
10             $secret = "公众号在微信的app secret";
11             $code = $_GET["code"];
12             $get_token_url = \'https://api.weixin.qq.com/sns/oauth2/access_token?appid=\'.$appid.\'&secret=\'.$secret.\'&code=\'.$code.\'&grant_type=authorization_code\';
13             $ch = curl_init();
14             curl_setopt($ch,CURLOPT_URL,$get_token_url);
15             curl_setopt($ch,CURLOPT_HEADER,0);
16             curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
17             curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
18             $res = curl_exec($ch);
19             curl_close($ch);
20             $json_obj = json_decode($res,true);
21             //根据openid和access_token查询用户信息
22             $access_token = $json_obj[\'access_token\'];
23             $openid = $json_obj[\'openid\'];
24             $get_user_info_url = \'https://api.weixin.qq.com/sns/userinfo?access_token=\'.$access_token.\'&openid=\'.$openid.\'&lang=zh_CN\';
25             
26             $ch = curl_init();
27             curl_setopt($ch,CURLOPT_URL,$get_user_info_url);
28             curl_setopt($ch,CURLOPT_HEADER,0);
29             curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
30             curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
31             $res = curl_exec($ch);
32             curl_close($ch);
33             
34             //解析json
35             $user_obj = json_decode($res,true);
36             $_SESSION[\'user\'] = $user_obj;
37             print_r($user_obj);
38         }