微信开发，服务器回应

<?php
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
if (isset($_GET['echostr'])) {
    $wechatObj->valid();
}else{
    $wechatObj->responseMsg();
}

class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];
        if($this->checkSignature()){
            header('content-type:text');
            echo $echoStr;
            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;
        }
    }
		public function outNews()
		{
			$a = "<ArticleCount>2</ArticleCount>
					<Articles>
					<item>
					<Title><![CDATA[news1]]></Title>
					<Description><![CDATA[news description1]]</Description>
					<PicUrl><![CDATA[http://a4.att.hudong.com/55/59/300001190444130294593273926_950.jpg]]></PicUrl>
					<Url><![CDATA[http://a4.att.hudong.com/55/59/300001190444130294593273926_950.jpg]]></Url>
					</item>
					<item>
					<Title><![CDATA[news1]]></Title>
					<Description><![CDATA[news description1]]</Description>
					<PicUrl><![CDATA[http://a4.att.hudong.com/55/59/300001190444130294593273926_950.jpg]]></PicUrl>
					<Url><![CDATA[http://a4.att.hudong.com/55/59/300001190444130294593273926_950.jpg]]></Url>
					</item>
					</Articles>
			";
				$xml = "<xml>
                        <ToUserName><![CDATA[%s]]></ToUserName>
                        <FromUserName><![CDATA[%s]]></FromUserName>
                        <CreateTime>%s</CreateTime>
                        <MsgType><![CDATA[news]]></MsgType>
                        $a
                        </xml>";
         return $xml;
		}
    public function responseMsg()
    {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

        if (!empty($postStr)){
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $fromUsername = $postObj->FromUserName;
            $toUsername = $postObj->ToUserName;
            $keyword = trim($postObj->Content);
            $time = time();
            $msgType = $postObj->MsgType;
            
            $textTpl = "<xml>
                        <ToUserName><![CDATA[%s]]></ToUserName>
                        <FromUserName><![CDATA[%s]]></FromUserName>
                        <CreateTime>%s</CreateTime>
                        <MsgType><![CDATA[%s]]></MsgType>
                        <Content><![CDATA[%s]]></Content>
                        <FuncFlag>0</FuncFlag>
                        </xml>";
            if($keyword == "?" || $keyword == "？")
            {
            #    $msgType = "text";
                $contentStr = date("Y-m-d H:i:s",time()) . $msgType;
                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
            }else if ( $keyword == 'news'){
								$tpl = $this->outNews();		            	
								echo sprintf($tpl,$toUsername, $fromUsername,$time);
								
            }
            else
            {
            	#	$msgType = "text";
                $contentStr = date("Y-m-d H:i:s",time())  . $keyword. $msgType;
                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
            }
        }else{
            echo "NULL";
            exit;
        }
    }
}
?>