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<?php
/**
  * wechat php test
  */

//define your token
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
//$wechatObj->valid();
$wechatObj->responseMsg();

class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];

        //valid signature , option
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    public function responseMsg()
    {
        //get post data, May be due to the different environments
        //$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        $postStr = file_get_contents("php://input");
        //file_put_contents("log.txt",$postStr,FILE_APPEND );
          //extract post data
        if (!empty($postStr)){
                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
                   the best way is to check the validity of xml by yourself */
                libxml_disable_entity_loader(true);
                  $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                //获取事件类型
                $event = $postObj->Event;//subscribe unsubscribe
                $time = time();
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            <FuncFlag>0</FuncFlag>
                            </xml>";
                switch($postObj->MsgType)
                {
                    case 'event':
                    if($event == 'subscribe')
                    {
                        $contentStr = "杜丝莉 i love you";
                        $msgType = 'text';
                        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;

                    }
                    break;
                    case 'text':
                        if($keyword == 'sima')
                        {
                            $newTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <ArticleCount>2</ArticleCount>
                            <Articles>
                            <item>
                            <Title><![CDATA[%s]]></Title>
                            <Description><![CDATA[%s]]></Description>
                            <PicUrl><![CDATA[%s]]></PicUrl>
                            <Url><![CDATA[%s]]></Url>
                            </item>
                            <item>
                            <Title><![CDATA[%s]]></Title>
                            <Description><![CDATA[%s]]></Description>
                            <PicUrl><![CDATA[%s]]></PicUrl>
                            <Url><![CDATA[%s]]></Url>
                            </item>
                            </Articles>
                            </xml>";
                        $msgType = 'news';
                        $title1 = 'one';
                        $des1 = 'this is one';
                        $pic1 = 'http://www.simadongyang.com/wx/pic/one.jpg';
                        $url1 = 'www.baidu.com';

                        $title2 = 'two';
                        $des2 = 'this is two';
                        $pic2 = 'http://www.simadongyang.com/wx/pic/two.jpg';
                        $url2 = 'www.sougou.com';
                        $resultStr = sprintf($newTpl, $fromUsername, $toUsername, $time, $msgType, $title1,$des1,$pic1,$url1,$title2,$des2,$pic2,$url2);
                        echo $resultStr;
                        }
                        
                    break;
                }             
                /*if(!empty( $keyword ))
                {
                      $msgType = "text";
                    if( $keyword == 'hello')
                    {
                        $contentStr = "你好";
                    }else{
                        $contentStr = "Welcome to wechat world!";
                    }
                    
                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;
                }else{
                    echo "Input something...";
                }*/

        }else {
            echo "";
            exit;
        }
    }
        
    private function checkSignature()
    {
        // you must define TOKEN by yourself
        if (!defined("TOKEN")) {
            throw new Exception('TOKEN is not defined!');
        }
        
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
                
        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        // use SORT_STRING rule
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );
        
        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }
}

?>