誰かが投票システムで投票をスワイプしています。解決してください。

<?phperror_reporting(0);session_start();require_once 'config.php';require_once COMMON_PATH.'Common.php';$common = new Common();date_default_timezone_set ('Asia/Shanghai');$weil = strtotime("2013-08-07 23:59:59"); $now = time();if($weil-$now < 0){//投票时间过期	echo 0;	exit;}$ip  = $common->getClientIp();$id  = $_POST['id'];$ipid=$ip.$id;if($_SESSION['ipid']==$ipid||$_COOKIE['ipid']==$ipid){//$array = array('48','49','67','47'); //if ( in_array($id,$array) ) {		echo 2;	} else {		$tbName = TB_NAME;		$limit_time = 3600;		$arr = $common->getItems('id,addTime','20130618_ztao_jtsjip','id','desc',"where tpId='$id' and ip='$ip'");		$row = false;		if (count($arr) > 0) {			$row = $arr[0];		}		if(!$row){				$common->insertItems('20130618_ztao_jtsjip','tpId,ip,addTime',"'$id','$ip','$now'");				$res = $common->updateItems("$tbName",'voteNum=voteNum+1',"$id");				$_SESSION['ipid']=$ipid;				setcookie("ipid","$ipid",time()+$limit_time);				if($res == true){					echo 1;//投票成功 				}else{					echo 3;				}					}else if(($now-$row['addTime'])>$limit_time){			$common->insertItems('20130618_ztao_jtsjip','tpId,ip,addTime',"'$id','$ip','$now'");			$res = $common->updateItems("$tbName",'voteNum=voteNum+1',"$id");			$_SESSION['ipid']=$ipid;			setcookie("ipid","$ipid",time()+$limit_time);			if($res == true){				echo 1;			}else{				echo 3;			}		}else if(($now-$row['addTime'])<$limit_time){			echo 2;		}else{			echo 3;		}}?>