$currentMonth = date("Y-m");
                $sql0 = "SELECT id FROM invoices WHERE due_date LIKE '$currentMonth-%' ";
                $result0 = mysqli_query($conn, $sql0);
	                while($r = mysqli_fetch_array($result0)) {
		                $id = $r["id"];
		                echo "</br></br>" . $r['id'] . "</br></br>";
		                $rows = explode( ' ', $r["id"]);
		                foreach($rows as $id){
			                $result = mysqli_query($conn, "SELECT total FROM invoice_items WHERE invoice_id = '$id' ");
			                while($row = mysqli_fetch_assoc($result)){
			                    echo $row['total'];
			                    $sumArray[] = $row['total'];
                            }
		                }
                }