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How to create custom Component in Yii2

Hi there, Today I would like to write a simple tutorial on creating custom Component in Yii2 and I will show you how to use created a component in your application.

Here are the simple steps, just follow the step at the end you will have your first custom component.

Make a folder named “components” in your project root folder.

Crate a file with desired component name inside components folder and copy past the below code. Example – MyComponent.php

namespace app\components;
use Yii;
use yii\base\Component;
use yii\base\InvalidConfigException;
class MyComponent extends Component
public function welcome()
  echo "Welcome to MyComponent";

Add your component inside the config/web.php file


'components' => [
          'mycomponent' => [
            'class' => 'app\components\MyComponent',

You are done!. Now you can use your component method “welcome” inside any of your app controller actions.


namespace app\controllers;
use Yii;
class TestController extends \yii\web\Controller
    public function actionWelcome()

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