php นำค่าจาก textbox วนลูป ยังไงครับ [มือใหม่หัดเขียนครับ]

  <form id="form2[]" name="form2[]" method="post" action="add.php" OnSubmit="return onSave();"/>
       <label for="orderno">หมายเลขคำสั่งซื้อ :</label>
         <input name="orderno[]" type="text" id="orderno[]" maxlength="13" />
        
       วันที่สั่งซื้อ : 
       <label for="dateorder"></label>
       <input name="dateorder[]" type="date" id="dateorder[]" />
       <br />
       <br />
     <?

	$objConnect = mysql_connect("localhost","root","root") or die("Error Connect to Database");
	$objDB = mysql_select_db("301l");
	// Search
	$strSQL = "SELECT * FROM partdata WHERE 1";
	if($_POST["supplier_name"] != "0")
	{
	 $strSQL .= " AND (supplier_name = '".$_POST["supplier_name"]."') ";
	}	
	
	$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
	?>
      <table width="624" height="46" border="0">
              <tr>
            
                <td width="94" height="16" bgcolor="#999999"><div align="center">รหัสชิ้นส่วน</div>
                <div align="center"></div></td>
                <td width="250" bgcolor="#999999"><div align="center">ชื่อชิ้นส่วน</div></td>
                <td width="99" bgcolor="#999999"><div align="center">จำนวนชิ้นต่อกล่อง</div></td>
                <td width="96" bgcolor="#999999"><div align="center">ชื่อบริษัท</div></td>
                <td width="81" bgcolor="#999999"><div align="center">จำนวนที่สั่งซื้อ</div></td>
            </tr>
              <?
	while($objResult = mysql_fetch_array($objQuery))
	 {   $partno=$objResult['partno'];
       $partname=$objResult['partname'];
	   $qty=$objResult['qty'];
	   $supplier_name=$objResult['supplier_name'];

	?>
              <tr >
              
                <td height="24"><div align="center">
                <input name="txtpartno[]" type="text" value="<?=$objResult['partno'];?>" id="txtpartno" size="10" maxlength="10">
                </div></td>
                <td><div align="center">
                  <input name="txtpartname[]" type="text" value="<?=$objResult['partname'];?>" id="txtpartname" size="35" maxlength="50" />
                </div></td>
                <td><div align="center">
                  <input name="txtqty[]" type="text" value="<?=$objResult['qty'];?>" id ="txtqty" size="3" maxlength="3" />
                </div></td>
                <td><div align="center">
                <input name="txtsupplier_name[]" type="text" value="<?=$objResult['supplier_name'];?>" id="txtsupplier_name" size="3" maxlength="3" />
                </div></td>
                <td><div align="center">
                  <label for="txtqtyorder"></label>
                  <input name="txtqtyorder[]" type="int" id="qtyorder" size="4" maxlength="4" />
                </div></td>
                    <?
	}
	?>
                
              </tr>
   
          </table>
          
         <?
  global $_POST, $_GET;
$objConnect = mysql_connect("localhost","root","root") or die("Error Connect to Database");
	$objDB = mysql_select_db("301l");
 $partno =  $_POST['partno'];
$partname = $_POST['partname'];
$qty = $_POST['qty'];
$supplier_name = $_POST['supplier_name'];

		  
		  ?>
         <p>
          <label for="daterecive">วันที่รับมอบสินค้า : </label>
            <input type="date" name="daterecive[]" id="daterecive" />
เวลาที่รับมอบ :
<label for="timerecive"></label>
<input type="time" name="timerecive[]" id="timerecive" />
          </p>
          <p>
            <input type="submit" name="button" id="button" value="เพิ่มข้อมูล" />
          </p>
        </form>

<?
$objConnect = mysql_connect("localhost","root","root") or die("Error Connect to Database");
$objDB = mysql_select_db("301l");

for($i=0;$i<count($_POST["form2"]);$i++)
	{
		if($_POST["form2"][$i] != "")
		{

$strSQL = "INSERT INTO orderdata SET ";
$strSQL .="partno = '".$_POST["txtpartno"][$i]."' ";
$strSQL .=",partname = '".$_POST["txtpartname"][$i]."' ";
$strSQL .=",qty = '".$_POST["txtqty"][$i]."' ";
$strSQL .=",supplier_name = '".$_POST["txtsupplier_name"][$i]."' ";
$strSQL .=",qtyorder = '".$_POST["txtqtyorder"][$i]."' ";
$strSQL .=",dateorder = '".$_POST["dateorder"][$i]."' ";
$strSQL .=",daterecive = '".$_POST["daterecive"][$i]."' ";
$strSQL .=",timerecive = '".$_POST["timerecive"][$i]."' ";
$strSQL .=",orderno = '".$_POST["orderno"][$i]."' ";



		}
	}

$objQuery = mysql_query($strSQL);
if($objQuery)
{
	echo "Save Done.";
}
else
{
	echo "Error Save [".$strSQL."]";
}
mysql_close($objConnect);
?>