zxcms/backend/controllers/SiteController.php

<?php
namespace backend\controllers;

use Yii;
use yii\web\Controller;
use yii\filters\VerbFilter;
use yii\filters\AccessControl;
use common\models\LoginForm;

/**
 * Site controller
 */
class SiteController extends Controller
{
    /**
     * @inheritdoc
     */
    public function behaviors()
    {
        return [
            'access' => [
                'class' => AccessControl::className(),
                'rules' => [
                    [
                        'actions' => ['error'],
                        'allow' => true,
                    ],
                    [
                        'actions' => ['index'],
                        'allow' => true,
                        'roles' => ['Dashboard'],
                    ],
	                [    // all the action are accessible to admin
		                'allow' => true,
		                'roles' => ['admin'],
	                ],
                ],
            ],
            'verbs' => [
                'class' => VerbFilter::className(),
                'actions' => [
                    'logout' => ['post'],
                ],
            ],
        ];
    }

    /**
     * @inheritdoc
     */
    public function actions()
    {
        return [
            'error' => [
                'class' => 'yii\web\ErrorAction',
            ],
        ];
    }

    /**
     * Displays homepage.
     *
     * @return string
     */
    public function actionIndex()
    {
        return $this->render('index');
    }

	public function beforeAction($action)
	{
		if ($action->id === 'error') {
			$this->layout = 'error';
		}
		return parent::beforeAction($action);
	}
}