**สอบถาม** เรื่อง การแก้ไขรายการ ที่สามารถเพิ่ม ลด งานได้นะครับ ไม่รู้จะเริ่มยังไงดี

if(isset($_GET['mode']) and $_GET['mode']=="editquote")
{
	//echo $_GET['mode'];
	$countwork_sql = "select * from tblquotation_detail where quid ='".$_POST['txtquteid']."'";
	$countwork_query = mysql_query($countwork_sql);
	$numwork_old = mysql_num_rows($countwork_query);
	//echo $numwork_old;
	//////////////////////////////////////////////////////////////////////////
	$Quid = $_POST['txtquteid'];
	$respon_name = $_POST['txtrespon'];
	$editdate = date("Y-m-d");
	$cusid = $_POST['selcus'];
	$projname = $_POST['project_name'];
	$picquote = $_POST['temppic'];
	$numwork = $_POST['hdnMaxLine'];
	$sum_total = $_POST['hdsum'];
	$rate_tax = $_POST['hdrate'];
	$optsig = $_POST['optsig'];
	$editquote_sql = "update tblquotation set project_name = '$projname', cid = '$cusid', qusignature = $optsig, respon_name = '$respon_name', filelogo ='$picquote',";
	$editquote_sql .= "work_num = $numwork, taxrate = $rate_tax, total_cost = $sum_total, edit_date = '$editdate' where quid = '$Quid'";
	//echo $editquote_sql;
	if(mysql_query($editquote_sql))
	{
		if($numwork == $numwork_old)
		{
			for($i=0;$i<$_POST['hdnMaxLine'];$i++)
			{
			  $id_qude =$_POST['hdqude_id'][$i];
			  $workname = $_POST['txtnamework'][$i];
			  $num = $_POST['selnum'][$i];
			  $unit = $_POST['selunit'][$i];
			  $cost = $_POST['txtamonut'][$i];
			  $total = $_POST['txtamonut'][$i]*$_POST['selnum'][$i];
			  /*echo "hdqude_id[$i] = ".$_POST["hdqude_id"][$i]."<br>";
			  echo "txtnamework[$i] = ".$_POST["txtnamework"][$i]."<br>";
			  echo "selnum[$i] = ".$_POST["selnum"][$i]."<br>";
			  echo "selunit[$i] = ".$_POST["selunit"][$i]."<br>";
			  echo "txtamonut[$i] = ".$_POST["txtamonut"][$i]."<br>";
			  echo "total = ".$total."<br>";
			  echo "///////////////////////////////////////////////<br>";*/
			  $update_quote = "update tblquotation_detail set work_name = '$workname',amount = $num,unit = '$unit',cost = $cost,total = $total where qude_id = $id_qude";
			  /*echo $update_quote."<br>";
			  echo "/////////////////////////////////////////////////////////////<br>";*/
			  mysql_query($update_quote);
			}//end for
		}//end if($numwork == $numwork_old)
		else if($numwork > $numwork_old)//กรณีเพิ่ม
		{
			echo "$numwork > $numwork_old";
		}//end if($numwork > $numwork_old)
		else if($numwork < $numwork_old)//กรณีลด
		{
			echo "$numwork < $numwork_old";
		}//if($numwork < $numwork_old)
	}//end if mysql_query($editquote_sql)
	
}