PHP MySQL Dual While Loop giving me problems - php

Question

I currently have a piece of code that I want to essentially pulls products quantity and prices and then give a grand total
The problem I have is the mathematics is way off... it's essentially multiplying the last quantity with the last price of the item during the loop (I hope I explained that with atleast half an ounce of clarity haha!)
Anyways here is the code, I think it was along the correct lines but somewhere I have gone wrong, Thanks!
<table>
<tr>
<th>Product Title</th>
<th>Nicotine Strength</th>
<th>Quantity</th>
<th>Price (inc. VAT)</th>
</tr>
<?php
$query = "SELECT `product`, `variant`, `quantity` FROM orders_detail WHERE order_id = '$orderid'";
$result = mysqli_query($con, $query);
$quantitytotal = 0;
while ($row = mysqli_fetch_assoc($result)) {
$product = $row['product'];
$stuff = $row['quantity'];
$variant = $row['variant'];
$linequantity = $stuff;
$quantitytotal += $stuff;
$pricequery = "SELECT product_price FROM products WHERE product_name = '$product'";
$priceresult = mysqli_query($con, $pricequery);
$pricetag = 0;
$priceline = 0;
while ($rowprice = mysqli_fetch_assoc($priceresult)) {
$price = $rowprice['product_price'];
$priceline = $price;
$pricetag += $price;
}
echo "Price: $pricetag<br>";
echo "Quantity: $quantitytotal<br>";
$linetotal = $priceline * $linequantity;
//echo "$product - $linequantity - $linetotal<br>";
echo '<tr><td>' . $product .' </td> ' . '<td>' . $variant . '</td>' . ' <td> ' . $linequantity . '</td>' . '<td> £' . $linetotal . '</td> </tr>';
}
$total = $pricetag * $quantitytotal;
?>
<tr><td>Total Ex Vat:</td><td> Total Inc Vat:</td></tr>
<tr><td><?php echo "£" . ($total / 1.2);?></td>
<td><?php echo "£" . $total; ?></td></tr>
</table>

Answer 1

You can calculate grand total by adding $linetotal in the loop.
$total=$total+$linetotal;
Initialize $total with 0 before loop.