$month = 2; * Şubat ayı için *
$year = date("Y"); *Geçerli yıl*
 
* Şubat ayının son gününü hesapla *
$lastDayOfMonth = new DateTime("$year-$month-01");
$lastDayOfMonth->modify('last day of this month');
 
* Sorguyu hazırla *
$monthlyIncome2 = $MySQL->prepare("SELECT COUNT(*) AS SAYI, SUM(`gun`) AS GUN, SUM(`miktar`) AS CIRO FROM `girdiler` WHERE `date_cikis` BETWEEN :start_date AND :end_date", array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
$monthlyIncome2->execute(array(":start_date" => "$year-$month-01", ":end_date" => $lastDayOfMonth->format('Y-m-d')));
$fetchMonthlyIncome2 = $monthlyIncome2->fetch(PDO::FETCH_OBJ);