php - Updating quantity for multiple products in shopping cart gives me zero -


hey guys trying work on. when user updates quantity on product supposed multiply quantity unit price of product. apparently, can work single product, if more that, turns 0 when try update quantity. here code please help.

    <tr align="left">     <th width="62"><input type="checkbox" name="remove[]" value="<?php echo $pro_id; ?>"/></th>     <th width="155">     <img src="admin_area/product_images/<?php echo $product_image; ?>" width="60" height="60" /><br>     <?php echo $product_title; ?> <br><br>     </th>     <th width="61"><?php echo $product_size; ?></th>     <th width="62"><?php echo $product_paper; ?></th>     <th width="67"><?php echo $product_grammage; ?></th>     <th width="60"><?php echo $product_finish; ?></th>     <th width="96"><?php echo $product_sides; ?></th>     <th width="76"><?php echo $product_print; ?></th>     <th width="105"><input type="text" size="6" name="qty" value="<?php $_session['qty']; ?>" /></th>      <?php      if(isset($_post['update_cart'])) {          $qty = $_post['qty'];          $update_qty = "update cart set qty='$qty'";          $run_qty = mysqli_query($con, $update_qty);          $_session['qty']=$qty;          $total = $total*$qty;          }     ?>   <th width="112"><?php echo "ugx" . $single_price; ?></th>  </tr>     <?php } } ?>  </table>  <table width="217" border="0" align="right" class="layoutcarttotal">   <tr>     <td colspan="2"><h2><b>sub total:</b></h2></td>     <td ><h2><?php echo "ugx" . $total; ?></h2></td>   </tr>   <tr>     <td><input type="submit" name="update_cart" class="mybutton" value="update order" /></td>     <td><input type="submit" name="continue" class="mybutton" value="continue shopping" /></td>     <td><input type="submit" name="checkout" class="mybutton" value="place order" /></td>   </tr> 


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