1 <?php
 2 /**
 3   * wechat php test
 4   */
 5 
 6 //define your token
 7 define("TOKEN", "weixin");
 8 $wechatObj = new wechatCallbackapiTest();
 9 $wechatObj->valid();
10 
11 class wechatCallbackapiTest
12 {
13     public function valid()
14     {
15         $echoStr = $_GET["echostr"];
16 
17         //valid signature , option
18         if($this->checkSignature()){
19             echo $echoStr;
20             exit;
21         }
22     }
23 
24     public function responseMsg()
25     {
26         //get post data, May be due to the different environments
27         $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
28 
29           //extract post data
30         if (!empty($postStr)){
31                 
32                   $postObj = simplexml_load_string($postStr, ‘SimpleXMLElement‘, LIBXML_NOCDATA);
33                 $fromUsername = $postObj->FromUserName;
34                 $toUsername = $postObj->ToUserName;
35                 $keyword = trim($postObj->Content);
36                 $time = time();
37                 $textTpl = "<xml>
38                             <ToUserName><![CDATA[%s]]></ToUserName>
39                             <FromUserName><![CDATA[%s]]></FromUserName>
40                             <CreateTime>%s</CreateTime>
41                             <MsgType><![CDATA[%s]]></MsgType>
42                             <Content><![CDATA[%s]]></Content>
43                             <FuncFlag>0</FuncFlag>
44                             </xml>";             
45                 if(!empty( $keyword ))
46                 {
47                       $msgType = "text";
48                     $contentStr = "Welcome to wechat world!";
49                     $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
50                     echo $resultStr;
51                 }else{
52                     echo "Input something...";
53                 }
54 
55         }else {
56             echo "";
57             exit;
58         }
59     }
60         
61     private function checkSignature()
62     {
63         $signature = $_GET["signature"];
64         $timestamp = $_GET["timestamp"];
65         $nonce = $_GET["nonce"];    
66                 
67         $token = TOKEN;
68         $tmpArr = array($token, $timestamp, $nonce);
69         sort($tmpArr);
70         $tmpStr = implode( $tmpArr );
71         $tmpStr = sha1( $tmpStr );
72         
73         if( $tmpStr == $signature ){
74             return true;
75         }else{
76             return false;
77         }
78     }
79 }
80 
81 ?>