$order_item_tax1_rate = 0;
$order_item_tax1_amount = 0;
$order_item_tax2_rate = 0;
$order_item_tax2_amount = 0;
$order_item_hc = 0;
$order_item_final_amount = 0;
$statement = $connect->prepare("
INSERT INTO tbl_order
(order_no, order_date, order_receiver_name, order_receiver_gstin, order_item_tax1_rate, order_item_tax1_amount, order_item_tax2_rate, order_item_tax2_amount, order_item_hc_, order_item_final_amount, order_datetime)
VALUES (:order_no, :order_date, :order_receiver_name, :order_receiver_gstin, :order_item_tax1_rate, :order_item_tax1_amount, :order_item_tax2_rate, :order_item_tax2_amount, :order_item_hc, order_item_final_amount, :order_datetime)
");
$statement->execute(
array(
':order_no' => trim($_POST["order_no"]),
':order_date' => trim($_POST["order_date"]),
':order_receiver_name' => trim($_POST["order_receiver_name"]),
':order_receiver_gstin' => trim($_POST["order_receiver_gstin"]),
':order_item_tax1_rate' => trim($_POST["$order_item_tax1_rate"]),
':order_item_tax1_amount' => trim($_POST["$order_item_tax1_amount"]),
':order_item_tax2_rate' => trim($_POST["$order_item_tax2_rate"]),
':order_item_tax2_amount' => trim($_POST["$order_item_tax2_amount"]),
':order_item_hc' => trim($_POST["$order_item_hc"]),
':order_item_final_amount' => trim($_POST["$order_item_final_amount"]),
':order_datetime' => date("Y-m-d")
)