下面这个方法是起到路由作用的，它是如何完成这个流程的

/**
	 * 控制器调度
	 *
	 */
	private static function control(){
		//二级域名
            //var_dump($GLOBALS['setting_config']['enabled_subdomain']);
		if ($GLOBALS['setting_config']['enabled_subdomain'] == '1' && $_GET['act'] == 'index' && $_GET['op'] == 'index'){
			$store_id = subdomain();
			if ($store_id > 0) $_GET['act'] = 'show_store';
		}
		$act_file = realpath(BASE_PATH.'/control/'.$_GET['act'].'.php');
		$class_name = $_GET['act'].'Control';
                //echo $act_file;
		if ([email protected]($act_file)){
		    if (C('debug')) {
		        throw_exception("Base Error: access file isn't exists!");
		    } else {
		        showMessage('抱歉！您访问的页面不存在','','html','error');
		    }
		}
		if (class_exists($class_name)){
			$main = new $class_name();
			$function = $_GET['op'].'Op';
			if (method_exists($main,$function)){
				$main->$function();
			}elseif (method_exists($main,'indexOp')){
				$main->indexOp();
			}else {
				$error = "Base Error: function $function not in $class_name!";
				throw_exception($error);
			}
		}else {
			$error = "Base Error: class $class_name isn't exists!";
			throw_exception($error);
		}
	}

$act_file = realpath(BASE_PATH.'/control/'.$_GET['act'].'.php');
$class_name = $_GET['act'].'Control';

if (class_exists($class_name)){
            $main = new $class_name();
            $function = $_GET['op'].'Op';
            if (method_exists($main,$function)){
                $main->$function();
            }elseif (method_exists($main,'indexOp')){
                $main->indexOp();
            }else {
                $error = "Base Error: function $function not in $class_name!";
                throw_exception($error);
            }
        }