FRONTEND_MVC/controllers/PageController.php

<?php

namespace app\controllers;
use app\models\Page;

class PageController extends \yii\web\Controller
{
    public $defaultAction = 'page';
    /**
     * {@inheritdoc}
     */
    public function actions()
    {
        return [
            'error' => [
                'class' => 'yii\web\ErrorAction',
            ]
        ];
    }
    
    public function actionPage($id)
    {
        $page = new Page();
        return $this->render('/site/page', [
            'model' => $page->findOne($id),
        ]);
    }

}