สวัสดีคะ ...ขออนุญาต ถามเรื่อง โค้ดสินค้าคงเหลือค่ะ PHP

$id = $_POST['pro_id'];
$cate_id = $_POST['cate_name'];
$name_product = $_POST['pro_name'];
$product_price = $_POST['pro_price'];
$product_quantity = $_POST['pro_quantity'];
$pro_remin = $_POST['pro_remin'];
$pro_weight = $_POST['pro_weight'];
$pro_set = $_POST['set_type'];
//---------------GET----------------

$action = $_GET['action'];
$id_action = $_GET['id_action'];

//----------------------------------

if(isset($action) and isset($id_action))
{
	if($action == "delete")
	{
       /* $sql_select_product = select("select * from product_type c inner join product p on c.id_protype = p.id_protype");
        if(count($sql_select_product) == 0)
        {*/
            if(delete("product","id_product = $id_action"))
            {
            echo '<div class="alert alert-dismissible alert-warning">
                    <button type="button" class="close" data-dismiss="alert">×</button>
                    <strong>สำเร็จ!</strong> ลบข้อมูลเรียบร้อย กรุณารอสักครู่...</div>';

                echo "<script>$('html, body').animate({
                    scrollTop: $('#data-in-table').offset().top
                    }, 1000);</script>";


            echo "<script>setTimeout(function(){from_load('admin/product.php');},1500);</script>";
            }
        }
       /* else
        {
            echo '<div class="alert alert-dismissible alert-danger">
					  <button type="button" class="close" data-dismiss="alert">×</button>
					  <strong>ผิดพลาด!</strong> ไม่สามารถลบข้อมูลได้เนื่องเนื่องมีข้อมูลอ้างถึง จาก ตารางสินค้า จำนวน '.count($sql_select_product).' แถว </div>';
        }
	}*/
}
else
{

	
if(empty($name_product) or empty($product_price) or empty($product_quantity) or empty($pro_weight))
{

	echo '<div class="alert alert-dismissible alert-danger">
		<button type="button" class="close" data-dismiss="alert">×</button>
		<strong>ผิดพลาด!</strong> กรุณากรอกข้อมูลให้ครบ เเล้วลองอีกครั้ง
		</div>';
}
else
{
	if(empty($id))
	{
		
			$data = array(
				"id_protype" => $cate_id,
                "name_pro" => $name_product,
                "price" => $product_price,
                "remain_num" => $product_quantity,
                "quantity" => $product_quantity,
                "weight" => $pro_weight
			);
			
			if(insert("product",$data))
			{
				echo '<div class="alert alert-dismissible alert-success">
					  <button type="button" class="close" data-dismiss="alert">×</button>
					  <strong>สำเร็จ!</strong> บันทึกข้อมูลเรียบร้อย กรุณารอสักครู่...</div>';
				echo "<script>setTimeout(function(){from_load('admin/product.php');},1500);</script>";
				
			}
			else
			{
				echo '<div class="alert alert-dismissible alert-danger">
					  <button type="button" class="close" data-dismiss="alert">×</button>
					  <strong>ผิดพลาด!</strong> เกิดข้อผิดพลาด - ไม่สามารถบันทึกข้อมูลได้</div>';
			
			}
		
	}
	else
	{
        
        
        //$sql_select_product_remain = select("select remain_num from product where id_product = $id ");
        
        //$remain_num = ($sql_select_product_remain[0]['remain_num'] + $product_quantity);
        
			$data = array(
				"id_protype" => $cate_id,
                "name_pro" => $name_product,
                "price" => $product_price,
                "remain_num" => $product_quantity,
                "quantity" => $product_quantity,
                "weight" => $pro_weight
			);
			
			if(update("product",$data,"id_product = $id"))
			{
							
			echo '<div class="alert alert-dismissible alert-success">
  			<button type="button" class="close" data-dismiss="alert">×</button>
  			<strong>สำเร็จ!</strong> แก้ไขข้อมูลเรียบร้อย กรุณารอสักครู่...</div>';

				echo "<script>$('html, body').animate({
        		scrollTop: $('#data-in-table').offset().top
    			}, 3000);</script>";

			echo "<script>setTimeout(function(){from_load('admin/product.php');},1500);</script>";
				
			}
			else
			{
				echo '<div class="alert alert-dismissible alert-danger">
  				<button type="button" class="close" data-dismiss="alert">×</button>
  				<strong>ผิดพลาด!</strong> เกิดข้อผิดพลาด - ไม่สามารถบันทึกข้อมูลได้</div>';
			
			}
		
	}
}
}

?>