authenticate($_GET['code']); $from = empty($_GET['from']) ? null : $_GET['from']; $page = 'index.php'; if (!empty($_GET['from'])) { $page = $_GET['from']; } if ($success) { redirect($page); } else { quit(get_page_header().'Echo error authenticating'); } } else { quit(get_page_header().'Echo error authenticating: '. $_GET['error_message']); }