问题
As I see if we want to instantiate a Model (for example named Post), we just have to call:
$post = new Post();
Now, I also want to instantiate a Controller (for example named Post, and php file for this controller named PostController.php). So I use this code:
$postController = new PostController();
However, I get an error when running this code.
I did some searching and found that it should be like the following to instantiate:
$postController = Yii::app()->createController('post/index');
It runs correctly. But I still wonder why the first approach doesn't work?
回答1:
Answering your exact question "why the first approach doesn't work".
The folder /protected/controller is NOT in "include path" of the project.
Just add 'import'=>array('application.controllers.*') into your config file or use
include(Yii::app()->getBasePath().DIRECTORY_SEPARATOR.'controllers'.DIRECTORY_SEPARATOR.'PostController.php');
just before creating an object of PostController. Ah and creating new controller requires a name for this controller, so it should be something like
$controller = new PostController('post_controller');
I would like to point out that this type of controller creation is useless in Yii, as you are creating a controller completely separated from project, so it will be almost useless. As you noted, the correct way to create controller is through Yii::app()->createController()
回答2:
Just use:
$controller = Yii::app()->controller;
This returns your current controller for request.
Also see docs here: http://www.yiiframework.com/doc/api/1.1/CApplication#controller-detail
来源：https://stackoverflow.com/questions/11771141/yii-cannot-instantiate-controller