tradematik suma koszyka

function cart_sum() {
    $sum = 0;

    if (isset($_COOKIE['trade_cart'])) {
        foreach ($_COOKIE['trade_cart'] as $id => $count) {
            $price = get_post_meta($id, 'attr_price');
            $sum += $price * $count;
        }
    }

    if (isset($_COOKIE['trade_shipment'])) {
        $parts = explode("|", $_COOKIE['trade_shipment']);
        $sum += $parts[1];
    }

    return $sum;

}

// uzycie:
// suma koszyka wynosi: <?php echo cart_sum(); ?> PLN