คำนวณ array อัตโนมัติ ( ราคาอาหาร ) ใช้ในการแก้ไขเพื่อเก็บข้อมูลบันทึกใหม่

  $sql1 = mysqli_query($connection,"select * from restaurant_orders where orderno = '".$_POST['id']."'");
	  $num1 = mysqli_num_rows($sql1);
    $arr=mysqli_fetch_array($sql1);
    $ordidarray = explode("@",$arr[11]);
    $ordnumarray = explode("@",$arr[12]);
    $option = '';
    $i = 101;
    // while($row = $sql1->fetch_assoc () ){
    //   $i++;
    //   $option .= '<option value="'.$row['id'].'">'.$row['title'].'</option>';

for($i=1; $i<count($ordidarray); $i++)
{
$product = get_product_details_1($ordidarray[$i]);

$price1 = $product['price'];
$price2 = $product['sale'];
if($price2 < $price1) {
  $realprice = $price2;
} else {
  $realprice = $price1;
}
$pid = $product['mainid'];
$image = get_catalog_image($pid);
$imarray = explode("@",$image['picture']);
$img = $imarray[0];
?>
  <div id="div<?php echo $i ?>">
  <div class="row" >
     <div >
       <?php $title = stripslashes($product["title"]);
       $sql2 = mysqli_query($connection,"select * from restaurant_product where title = '".$title."'");
       $arr=mysqli_fetch_assoc($sql2);
       $mainid = $arr['id'];
   	   // $num1 = mysqli_num_rows($sql1);
       ?>
       ชื่ออาหาร  <select name="productid[]" id="productid" class="form-control" style="width:150px;" >
         <option value="<?php echo $mainid; ?>"><?php echo $title ?></option>
         <!-- <?php echo $option1; ?> -->
       </select>
       ราคาต่อหน่วย
       <?php
       if($price2 < $price1) {
         echo "<input   type=\"text\" name=\"pid\" id=\"pid\" style=\"width:50px;\" value='".number_format($price2,2)."'  readonly>บาท";
       } else {
         echo "<input   type=\"text\" name=\"pid\"  id=\"pid\" style=\"width:50px;\" value='".number_format($realprice,2)."' readonly >บาท";
       }
          ?>
     <!-- <input type="text" name="" value="" style="width:50px;"> -->
     จำนวน<input type="text" name="num" id="num" value="<?php echo $ordnumarray[$i] ?>"  style="width:50px;" >
     ราคารวม<input type="text" name="total" id="total" value="<?php echo number_format(($realprice*$ordnumarray[$i]),2) ?>"  style="width:50px;"  readonly>
     <?php
     $totalprice = $totalprice + ($realprice*$ordnumarray[$i]);

      ?>
    <!-- <button type="button" class="btn btn-danger delete"  id="<?php echo $i;  ?>"><i  class="fa fa-minus" style="margin-right:10px;" aria-hidden="true"></i>ลบ</button> -->
</div>
</div>
</div>
<?php
}
$i++;
echo "รวม :" .$totalprice.""