提供一个集中的请求处理机制，所有的请求都将由一个单一的处理程序处理。
Copy

class View 
{
    public function show($request)
    {
        echo('SHOW ' . $request);
    }
}

class Dispatcher 
{
    private $view;

    public function __construct()
    {
        $this->view = new View();
    }

    public function dispatch($request)
    {
        return $this->view->show($request);
    }
}

class FrontController
{
    private $dispatcher;

    public function __construct()
    {
        $this->dispatcher = new Dispatcher();
    }

    public function dispatchRequest(String $request)
    {
        // 统一处理一些逻辑
        $this->dispatcher->dispatch($request);
    }
}

$frontController = new FrontController();
$frontController->dispatchRequest("TEST");
Copy