$sth = $db -> prepare ("UPDATE post SET title=?,content=?,category=?,status=?,time=?,lang=? WHERE id=?");
$sth -> execute(array($note,$content,$category,$status,$time,$notalang,$mdata));

yerine;

$sth = $db -> prepare ("UPDATE post SET title=:baslik,content=:icerik,category=:kat,status=:durum,time=:zaman,lang=:dil WHERE id=:sira");
$sth -> execute(array("baslik"=>$note,"icerik"=>$content,"kat"=>$category,"durum"=>$status,"zaman"=>$time,"dil"=>$notalang,"sira"=>$mdata));
dener misin?