$sql = "select * from ayarlar where admin=(select bayi from bayi where admin='".$_SESSION[admin]."' and kademe='admin') and DATE_FORMAT(now(),'%H:%i') between sitekapanis and siteacilis";
            $sorgu = mysql_query($sql);
            while($oku=mysql_fetch_assoc($sorgu)){
                if($_SESSION["kademe"]=="kullanici"){
                session_destroy();
                }
            }
        }