60*60*24 = 7200 yapmaz ne yazıkki

session_start();
ob_start();
setcookie("kullanici",$_SESSION["userid"], time() - 60*60*24);
setcookie("seviye",$_SESSION["level"], time() - 60*60*24);
session_destroy();
if($_SERVER["HTTP_REFERER"])
{header("location:$_SERVER[HTTP_REFERER]");}
else{header("location:/");}