OpenCart url.php

<?php
final class Url {

    public function http($route) {
        if (HTTPS_IS_SHARED_SERVER == 1 && !$this->isSSL())
            return HTTP_SERVER . 'index.php?route=' . str_replace('&', '&amp;', $route);
        else
            return HTTP_SERVER . 'index.php?route=' . str_replace('&', '&amp;', $route) . '&amp;sid=' . session_id();
    }

    public function https($route) {

        if (HTTPS_SERVER != '') {
            if (HTTPS_IS_SHARED_SERVER == 1 && !$this->isSSL())
                $link = HTTPS_SERVER . 'index.php?route=' . str_replace('&', '&amp;', $route) . '&amp;sid=' . session_id();
            else
                $link = HTTPS_SERVER . 'index.php?route=' . str_replace('&', '&amp;', $route);
        } else {
            $link = HTTP_SERVER . 'index.php?route=' . str_replace('&', '&amp;', $route);
        }

        return $link;
    }

    public function isSSL() {
        return (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == "on") ? true : false;
    }
}
?>