: $totalLoan = "0000000"; $interest= "0"; //<-- 0% $loan = 0; $fixedDateEveryMonth = 00; $start = new DateTime(date('Y-m-') . $fixedDateEveryMonth); for($i = 0; $i <= $loan; $i++) {     $start->add(new DateInterval("P0M"));     $dateLoan = $start->format('Y-m-d');     