$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
$xmlObj = simplexml_load_string($postStr,'SimpleXMLElement',LIBXML_NOCDATA);
$xmlArr = json_decode(json_encode($xmlObj),true);
if($xmlArr['MsgType']=="text"){
    if(!empty($xmlArr['Content'])){
        if($xmlArr['Content']=="1"){
            $reply="aaaaaa";
            echo send($reply);
        }
        else{
            $reply="lalala";
            echo send($reply);
        }
    }
}
function send($reply){
    global $xmlArr;
    $str="<xml>
    <ToUserName><![CDATA[".$xmlArr['FromUserName']."]]></ToUserName>
    <FromUserName><![CDATA[".$xmlArr['ToUserName']."]]></FromUserName>
    <CreateTime>".$xmlArr['CreateTime']."</CreateTime>
    <MsgType><![CDATA[text]]></MsgType>
    <Content><![CDATA[".$reply."]]></Content>
    </xml>";
        return $str;
}