Correct organization of the call structure from the controller?

Question

Yii

Kind. Again, I'm tormented by children's questions. Guys, tell me how to properly organize such a construction of calls?
In a nutshell. The Action is given a parameter, and then it is sorted out according to the case.
But apparently, this is possible somehow simply and possibly not correctly.
How would "correctly" knowledgeable people do it?

public function actionIndex( $task = null ){

    switch ( $task ) {
      case 'settings':      return $this->render('index', []); break;
      case 'showallpages':  return $this->render('pagelist', []); break;
      case 'editpage':
        $model = new Page( Yii::$app->request->get('pageId') );
        return $this->render( 'editPage', [ 'model' => $model ] );
      break;
      case 'savepage':
        return 'SAVED !!!!!'; 
      break;

      default: return $this->render( 'index', [] ); break;
    }
  }

Answer 1

Remove the switch and do 4 actions.