php - 访问父变量

Question

我应该如何访问这个变量？

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

所以我想在我的另一个 Controller 上访问 $view

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

Answer 1

这样你就不行了。 $view 是函数中的局部变量。但是你可以把它变成 protected property所以它不能从外部访问，但可以继承:

Members declared protected can be accessed only within the class itself and by inherited and parent classes.

所以你的类(class)会是这样的:

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;
    }
}