WeChat 開発モデルに関する PHP コード

<?php/**  * wechat php test  *///define your tokendefine("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 = $GLOBALS["HTTP_RAW_POST_DATA"];      	//extract post data		if (!empty($postStr)){                              	$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);                $fromUsername = $postObj->FromUserName;                $toUsername = $postObj->ToUserName;				$type =$postObj->MsgType;				$customevent = $postObj->Event;				$latitude =$postObj->Location_X;				$longitude =$postObj->Location_Y;                $keyword = trim($postObj->Content);                $time = time();                $textTpl = "<xml>							<ToUserName><![CDATA[%s]]></ToUserName>							<FromUserName><![CDATA[%s]]></FromUserName>							<CreateTime>%s</CreateTime>							<MsgType><![CDATA[%s]]></MsgType>							<Content><![CDATA[%s]]></Content>							<FuncFlag>0</FuncFlag>							</xml>";             			switch($type)			{			case "event";			if($customevent == "subscribe")			{$contentStr = "感谢关注"}			break;			case "image"			$contentStr ="图片很棒"；		    break;			case "location";			$contentStr ="{$latitude},{longitude}";			break;			case "text";			switch($keyword)			{case "1"			 $contentStr="1"			 break;			 case "2"			 $contentStr ="2"			 break;			 default;			 $contentStr= "hi";}			 break;			 }			 $msgType = "text";			 $resultStr = sprintf($textTpl,$fromUsername,$toUsername,$time,$msgType,$contentStr);			 echo $resultStr;			 }else             	              {        	echo "";        	exit;        }    }			private function checkSignature()	{        $signature = $_GET["signature"];        $timestamp = $_GET["timestamp"];        $nonce = $_GET["nonce"];	        				$token = TOKEN;		$tmpArr = array($token, $timestamp, $nonce);		sort($tmpArr, SORT_STRING);		$tmpStr = implode( $tmpArr );		$tmpStr = sha1( $tmpStr );				if( $tmpStr == $signature ){			return true;		}else{			return false;		}	}}?>