Question

我应该如何访问此变量？

class BaseController
{
    public function __construct()
    {
        $view = new Views;
        $view->layout = 'master';
    }
}

所以我想在我的其他控制器上访问$ view

class HomeController extends BaseController
{
    public function showForm()
    {
        // Access $view
    }
}

Answer 1

这种方式你不能。 $view是函数中的局部变量。但你可以把它设为protected property，因此无法从外部访问，但可以继承：

声明受保护的成员只能在类中访问本身以及继承和父类。

所以你的课程就像：

class BaseController
{
    protected $view;

    public function __construct()
    {
        $this->view = new Views;
        $this->view->layout = 'master';
    }
}

然后访问它：

class HomeController extends BaseController
{
    public function showForm()
    {
        echo $this->view->layout;
    }
}

Answer 2

class BaseController {
    protected $view = null;
    public function __construct() {
        $view = new Views;
        $view->layout = 'master';
        $this->view = $view;
    }
}
class HomeController extends BaseController {
    public function showForm() {
        // Access $view
        echo parent::$view;
    }
}

Answer 3

class BaseController
{
    public function __construct()
    {
        $this->view         = new Views;
        $this->view->layout = 'master';
    }
}

class HomeController extends BaseController
{
    public function showForm()
    {
        echo $this->view->layout;
    }
}

Answer 4

使用protected in class定义$ view并避免使用此代码，因为您增加了依赖性

    class BaseController{
       public function __construct(){
         $view = new Views;
         $view->layout = 'master';
       }
    }

将您的代码更改为：

    class BaseController{
       protected $view;
       public function __construct($view = null){
          $this->view = $view;
          $this->view->layout = 'master';
      }
}



class HomeController extends BaseController{
   public function showForm(){
     echo parent::$view;
   }
}

访问父变量

4 个答案: