Creating Controller and Action

In order to handle a request, the first thing to do is to create a new controller.

The things you must remember while creating a file controller are as follows:

• The namespace at the top (in basic application usually app\controllers)
• The use path for used class
• The controller class must extend the yii\web\Controller class
• The actions are handled from controller functions whose name starts with action and the first letter of each word is in uppercase

Let's point to basic/controllers and create a file named NewsController.php.

Then, create a class with the same name as the file and extend it from controller; finally, create an action named index to manage request for news/index:

<?php

// 1. specify namespace at the top (in basic application usually app\controllers);
namespace app\controllers;

// 2. specify 'use' path for used class;
use Yii;
use yii\web\Controller;

// 3. controller class must extend yii\web\Controller class;
// This line is equivalent...