$arr = array( array( "tarih" => "2006-08-31", "adi" => "Melih", ), array( "tarih" => "2007-11-29", "adi" => "Kaya", ), array( "tarih" => "2002-10-02", "adi" => "Süleyman", ));
array_multisort( array_column($arr, "tarih"), SORT_ASC, $arr );
Kolay gelsin.