php $HTTP_COOKIE_VARS 執行個體投票資料限制

if ($http_cookie_vars["vote"]) {
 echo "<script>alert('您已經投過票了，請不要重複投票');history.back();</script>";
 exit;
}
$vcount=$_post["vcount"];
$lld=$_post["jump"];
$tys=$_post["tys"];
if (!$vcount) {
 echo "<script>alert('您還沒有選擇任何投票項目');history.back();</script>";
 exit;
}
$db=@mysql_connect("localhost","root","root") or die("資料庫教程串連失敗");
mysql_select_db("vote",$db);
if ($vcount&&$lld) {
 if ($tys=="1") {
  $sql="update vote set vcount=vcount+1 where id=$vcount";
  $result=mysql_query($sql,$db);
  setcookie("vote","vote",time()+3600);
  echo "<script>alert('投票成功！');location.href='vote.php?id=$lld';</script>";
 }
 else {
  for ($i=0;$i<sizeof($vcount);$i++) {
   $sql1="update vote set vcount=vcount+1 where id=$vcount[$i]";
   $result1=mysql_query($sql1,$db);
  }
  setcookie("vote","vote",time()+3600);
  echo "<script>alert('投票成功！');location.href='vote.php?id=$lld';</script>";
 }
}