$totalHarcama = $db->query("SELECT SUM(Harcama_Tutar) AS total FROM Harcamalar")->fetch()["total"] ?? 0;
$totalDGHarcama = $db->query("SELECT SUM(DG_Tutar) AS total FROM DG_Harcamasi")->fetch()["total"] ?? 0;
$totalHarcama = str_replace(".", "", $totalHarcama);
$totalHarcama = str_replace(",", ".", $totalHarcama);
$totalHarcama  =floatval($totalHarcama);
$totalDGHarcama = str_replace(".", "", $totalDGHarcama);
$totalDGHarcama = str_replace(",", ".", $totalDGHarcama);
$totalDGHarcama =floatval($totalDGHarcama);
$total = number_format($totalHarcama + $totalDGHarcama, 2);
echo ($total) . " ₺";