关于微信开发模式的PHP代码,该怎么解决

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

public function valid()<br />    {<br />        $echoStr = $_GET["echostr"];<br /> <br />        //valid signature , option<br />        if($this->checkSignature()){<br />            echo $echoStr;<br />            exit;<br />        }<br />    }

public function valid()<br>    {<div class="clear">
                 
              
              
        
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