più variabili in un ciclo for come si fa?

[blur]

$itemQty    = $_POST['txtQty'];
$prezzo     = $_POST['prezzo'];
$sconto     = $_POST['sconto'];  
$numItem    = count($itemQty);
$numItem1    = count($prezzo);
$numItem2    = count($sconto);
$numDeleted = 0;
    $notice     = '';

    for ($i = 0, $numItem1, $numItem2; $i < $numItem; $i++) {
        $newQty = (int)$itemQty[$i];
                $newQty1 = (int)$prezzo[$i];
                $newQty2 = (int)$sconto[$i];
        if ($newQty < 1) {
            // remove this item from shopping cart
            deleteFromCart($cartId[$i]);
            $numDeleted += 1;
        } else {

            // update product quantity
            $sql = "UPDATE tbl_cart
                    SET ct_qty = $newQty,
                        ct_price = $newQty1,
                        ct_sconto = $newQty2
                    WHERE ct_id = {$cartId[$i]}";

            dbQuery($sql);
        }
    } 

ok, funziona!
grazie