[SOLVED] trouble with comma

[jakebur01]

I have comma screwing up my shipping calculation. I have been trying to replace the comma with nothing but I am still having trouble.

function calculate_shipping_cost()
{
  // as we are shipping products all over the world 
  // via teleportation, shipping is fixed
//  return 20.00;


$base =   $_SESSION['weight'];
//$base = 12;
// $base=str_replace(',','',$base);
$multiply = $base*1.1;

// $multiply=str_replace(',','',$multiply);
$final =   $multiply+8;
// $final=str_replace(',','',$final);

return $final;
}

function display_shipping($shipping)
{
  // display table row with shipping cost and total price including shipping
  $_SESSION['shipping']=number_format($shipping, 2);
  $_SESSION['complete_order']=number_format($shipping+$_SESSION['total_price'], 2);
  
?>
  <table border = 0 width = '100%' cellspacing = 0>
  <tr><td align = 'left'>Shipping</td>
      <td align = 'right'> <?php echo number_format($shipping, 2); ?></td></tr>
  <tr><th bgcolor='#cccccc' align = 'left'>TOTAL INCLUDING SHIPPING</th>
      <th bgcolor='#cccccc' align = 'right'>$<?php echo number_format($shipping+$_SESSION['total_price'], 2); ?></th>
  </tr>
  </table><br />
<?php
}

 if(!isset($_SESSION['cart']))
    {
      $_SESSION['cart'] = array();
      $_SESSION['items'] = 0;
      $_SESSION['total_price'] ='0.00';
      $_SESSION['weight'] = 0;
    }

    if(isset($_SESSION['cart'][$new]))
      $_SESSION['cart'][$new]++;
    else 
      $_SESSION['cart'][$new] = 1;

    $_SESSION['total_price'] = calculate_price($_SESSION['cart']);
    $_SESSION['items'] = calculate_items($_SESSION['cart']);
    $_SESSION['weight'] = calculate_weight($_SESSION['cart']);
  }

  if(isset($_POST['save']))
  {   
    foreach ($_SESSION['cart'] as $isbn => $qty)
    {
      if($_POST[$isbn]=='0')
        unset($_SESSION['cart'][$isbn]);
      else 
        $_SESSION['cart'][$isbn] = $_POST[$isbn];
    }
    $_SESSION['total_price'] = calculate_price($_SESSION['cart']);
    $_SESSION['items'] = calculate_items($_SESSION['cart']);
    $_SESSION['weight'] = calculate_weight($_SESSION['cart']);
  }

 

 

 

 

[jakebur01]

if I echo calculate_shipping_costs() using a weight of 999, the function will return 9 for some reason.