Creating a controller in the Yii framework requires naming, location and inheritance specifications. 1. The name and location must be standardized: the controller class name ends with Controller, such as PostController, the main application is delegated to the controllers/ directory, and the module is placed in the controllers folder of the corresponding module; 2. Write the controller content: define the class and inherit yii\web\Controller (Web application) or yii\console\Controller (command line), such as namespace app\controllers; use yii\web\Controller; class PostController extends Controller { ... }; 3. The URL access method consists of the controller ID and the action ID, and the default format is /controller ID/action ID, such as PostController For post, access the actionIndex() is /post/index; 4. The view file is located in the views/controller ID/ directory by default. For example, the PostController view is in views/post/index.php, and it needs to be created manually to avoid errors. Follow these steps to create a controller and implement page rendering.
Creating a new controller in the Yii framework is actually a very basic but very practical operation. If you already understand the basic concepts of MVC architecture, this step will be easier to get started.
Naming and location must be standardized
Yii is a framework that follows conventions over configuration principles, so when creating a controller, you must first pay attention to the naming and storage location.
- Controller class names usually end with
Controller, such asPostController. - By default, the controller should be placed in
controllers/directory. - If you are using modules, you need to put them in the
controllersfolder under the corresponding module.
For example, if you want to create a controller that processes articles, the name can be called PostController.php and placed in the controllers folder of the main application.
Writing controller content
After creating the file, you need to define the controller class in this PHP file and inherit yii\web\Controller (if it is a web application) or yii\console\Controller (if it is a command line tool).
namespace app\controllers;
use yii\web\Controller;
class PostController extends Controller
{
public function actionIndex()
{
return $this->render('index');
}
}In the above example:
-
actionIndex()is an action that can be accessed through a URL like/post/index. -
render()method will render a view file namedindex.php, which will be searched inviews/post/directory by default.
You can add multiple actionXXX() methods as needed to handle different requests.
How did URL access come from?
In Yii, the default URL format is as follows: /控制器ID/動作ID . Controller ID is the camel writing method of removing Controller and converting it to lowercase.
for example:
- The controller ID corresponding to
PostControllerispost - The controller ID corresponding to
SiteControllerissite
So when accessing actionView() method in PostController , the URL is /post/view .
If you use a module, the format is /模塊ID/控制器ID/動作ID , such as /admin/post/create .
This mapping is controlled by urlManager . If you want to customize the path, you can modify the URL rules in the configuration file.
Don't forget the view file
render() method in the controller is used to load the view. By default, it will find the corresponding view file in views/控制器ID/ directory.
For example, PostController above will go to views/post/index.php to find templates. If you don't have this file, the page will report an error or a blank space.
You can create these directories and files manually first to avoid errors. The view file is actually an ordinary PHP page, used to output HTML content.
Basically that's it. Creating a controller is not complicated, but many details are easily overlooked, especially the problem of namespace, file location, and view path. As long as you follow the specifications, there will generally be no problems.
The above is the detailed content of How do I create a new controller in Yii?. For more information, please follow other related articles on the PHP Chinese website!
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