前端控制器模式

//frontController
class HomeView
{
    public function show()
    {
        echo "Displaying Home Page". "<br />";
    }
}

class StudentView
{
    public function show()
    {
        echo "Displaying Student Page". "<br />";
    }
}

class Dispatcher
{
    private $studentView = null;
    private $homeView = null;
    
    public function __construct()
    {
        $this->studentView = new StudentView();
        $this->homeView = new HomeView();
    }
    
    public function dispatch($request)
    {
        //返回0就是相等
        if (!strcasecmp('STUDENT', $request)) {
            $this->studentView->show();
        } else {
            $this->homeView->show();
        }
    }
}

class FrontController
{
    private $dispatcher = null;
    public function __construct()
    {
        $this->dispatcher = new Dispatcher();
    }
    public function isAuthenticUser(){
        echo "User is authenticated successfully.";
        return true;
    }
    public function trackRequest($request)
    {
        echo "Page requested: " . $request;
    }
    
    public function dispatchRequest($request)
    {
        //记录每一个请求
        $this->trackRequest($request);
        //对用户进行身份验证
      if($this->isAuthenticUser()){
         $this->dispatcher->dispatch($request);
      }
    }
}

$FrontController = new FrontController();
$FrontController->dispatchRequest("HOME");
$FrontController->dispatchRequest("STUDENT");

参考文章 http://www.runoob.com/design-pattern/front-controller-pattern.html