public static function getInstance()
{
if (!is_object(self::$instance)) {
self::$instance = new ExtensionMaster();
//$application = Application::getInstance();
//$mainmenu = MainMenu::getInstance();
//$semester = Semester::getInstance();
//$signin = SignIn::getInstance();
//$error = Error::getInstance();
//$notFound = NotFound::getInstance();
}
return self::$instance;
}
