Items count in Shopping Cart plugin

<?php

$items_count = 0;
require_once ABSPATH . 'wp-content/plugins/wp-checkout/wp-checkout.php';
if (class_exists('wpCheckout')) {
    if ($wpCheckout = new wpCheckout()) {
        global $Item;
        $items_count = $Item -> item_count($order_id, 'items');
    }
}

if (!empty($items_count)) {
    //output your shopping cart icon here
}

?>