What is controller in Yii?

What is controller in Yii?

A controller is an instance of CController or of a class that extends CController. It is created by the application object when the user requests it. An action , in its simplest form, is just a controller class method whose name starts with action . A controller has a default action.

What is the name of the default controller of the yii2 console application?

site
Default Controller For Web applications, its value is ‘site’ , while for console applications, it is help .

How do I change the default page in yii2?

6 Answers. You can create a new controller with it’s own view: comingsoon (see http://www.yiiframework.com/doc/guide/1.1/en/topics.gii). Method 2: Let 404 error page display a coming soon message. Method 3: Redirect to error page using URL manager rules in main.

What is Yii ::$ app?

Each Yii application system contains a single application object which is created in the entry script and is globally accessible through the expression \Yii::$app . Info: Depending on the context, when we say “an application”, it can mean either an application object or an application system.

What is widget in yii2?

Advertisements. A widget is a reusable client-side code, which contains HTML, CSS, and JS. This code includes minimal logic and is wrapped in a yii\base\Widget object. We can easily insert and apply this object in any view.

What is yii2 PHP framework?

Yii is an open source, object-oriented, component-based MVC PHP web application framework. Yii is pronounced as “Yee” or [ji:] and in Chinese it means “simple and evolutionary” and it can be an acronym for “Yes It Is!”.

How do I start Yii serve?

If you are new to Yii, we strongly recommend you stick to the Basic Project Template for its simplicity yet sufficient functionalities.

1. Installing via Composer. Installing Composer.
2. Installing from an Archive File.
3. Other Installation Options.
4. Installing Assets.
5. Verifying the Installation.
6. Configuring Web Servers.

Who created Yii Framework?

developer Qiang Xue
Yii is mature, time-tested and stable. Created by developer Qiang Xue, Release 1. x has been around since 2008.

What is the automatic action parameter binding in Yii?

Since version 1.1.4, Yii has added support for automatic action parameter binding. That is, a controller action method can define named parameters whose value will be automatically populated from $_GET by Yii. To illustrate how this works, let’s assume we need to write a create action for PostController. The action requires two parameters:

Why am I getting a chttpexception (error code 400) from Yii?

Because $category does not have a default value, if the request does not include a category parameter, a CHttpException (error code 400) will be thrown automatically. Starting from version 1.1.5, Yii also supports array type detection for action parameters.

How do I change the default action of a controller?

A controller has a default action. When the user request does not specify which action to execute, the default action will be executed. By default, the default action is named as index. It can be changed by setting the public instance variable, CController::defaultAction.

What characters should a controller ID contain?

By default, controller IDs should contain these characters only: English letters in lower case, digits, underscores, hyphens, and forward slashes. For example, article and post-comment are both valid controller IDs, while article?, PostComment, admin\\post are not. A controller ID may also contain a subdirectory prefix.