Session::get PHP Method

    public static function get($key)
    {
        if (isset($_SESSION[$key])) {
            $value = $_SESSION[$key];
            // filter the value for XSS vulnerabilities
            return Filter::XSSFilter($value);
        }
    }

    public function getHtml()
    {
        $transHtml = array();
        $request = $this->controller->getRequest();
        if ($this->controller instanceof CheckoutController && $request->getActionName() == 'completed') {
            $session = new Session();
            if ($orderID = $session->get('completedOrderID')) {
                $order = CustomerOrder::getInstanceByID((int) $session->get('completedOrderID'), CustomerOrder::LOAD_DATA);
                $order->loadAll();
                $orderArray = $order->toArray();
                $data = array($order->getID(), '', $orderArray['total'][$orderArray['Currency']['ID']], $order->getTaxAmount(), $orderArray['ShippingAddress']['city'], $orderArray['ShippingAddress']['stateName'], $orderArray['ShippingAddress']['countryID']);
                $transHtml[] = 'pageTracker._addTrans' . $this->getJSParams($data);
                foreach ($orderArray['cartItems'] as $item) {
                    $data = array($order->getID(), $item['Product']['sku'], $item['Product']['name'], $item['Product']['Category']['name'], $item['price'], $item['count']);
                    $transHtml[] = 'pageTracker._addItem' . $this->getJSParams($data);
                }
            }
            $transHtml[] = 'pageTracker._trackTrans();';
        }
        return '<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src=\'" + gaJsHost + "google-analytics.com/ga.js\' type=\'text/javascript\'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("' . $this->getValue('code') . '");
pageTracker._initData();
pageTracker._trackPageview();
' . implode("\n", $transHtml) . '
</script>';
    }