Få fram värde från hidden-fält

<div id="main">
<div id="shopping_cart">
<form action="?page=quick_by" method="post">
<?php
   
   include("db.php");   
   $get_products = "SELECT * FROM products LIMIT 2";
   $result_products = mysql_query($get_products)
      or die(mysql_error());
   
   while($row_products = mysql_fetch_row($result_products))
   {
      $id = $row_products[0];
      //Get the flavors
      $get_flavors = "SELECT flavor FROM flavors WHERE product_id=$id LIMIT 2 ";
      $flavor_result = mysql_query($get_flavors)
               or die(mysql_error());
      
      while($flavor_row = mysql_fetch_row($flavor_result))
      {
      
?>
         
         <table border="0" cellspacing="0" cellpadding="0" width="">
         <td class="shopping_cart"></td>
         <td class="shopping_cart">Produkt</td>
         <td class="shopping_cart">Smak</td>
         <td class="shopping_cart">Antal</td>
         <tr>
         <td><img src="admin/logged_in/product_images/thumb/<?= $row_products[1] ?>"></td>
         <td><?= $row_products[2] ?></td>
         <td><?= $flavor_row[0] ?></td>
         <td><input type="text" name="qty"><input type="hidden" name="product" value="<?= $row_products[0] ?>"></td></tr>
         
 
<?php
      }
   }
?>
<input type="submit" name="submit" value="vidare">
</form>
</div>
<?php
if(isset($_POST['submit']))
{
   if(isset($_POST['qty']))
   {
      if(isset($_POST['product']))
      {
         foreach($_POST as $pd)
         {
            
         }
      }
 
   }
}
?>