替每篇文章都在用户那加个COOKIE代表已查看过.合理吗

$gid = $_GET["id];
if( !isset($_COOKIE["user"]) ){ 
	setcookie("user","newGuest",time()+3600); 
}else { 
	setcookie("user","oldGuest"); 
} 

if ( $_COOKIE["user"] != "oldGuest") {
	$hits_now = $row["hits"]+1;
	$pdo->exec("UPDATE `gamedb_game` SET `hits`='$hits_now' WHERE `id` = '$gid'");	
}

$gid = $_GET["id];
if( !isset($_COOKIE["user"]) ){ 
	setcookie("user","newGuest",time()+3600); 
}else { 
	setcookie("user","oldGuest_$gid"); 
} 

if ( $_COOKIE["user"] != "oldGuest_$gid") {
	$hits_now = $row["hits"]+1;
	$pdo->exec("UPDATE `gamedb_game` SET `hits`='$hits_now' WHERE `id` = '$gid'");	
}