Yii2 - navbar dropdown menu

    
        echo Nav::widget([
            'items' => [
                [
                    'label' => 'Profile', 'items' =>
                    [
                        ['label' => 'Friends', 'url' => ['/user/friends']],
                        ['label' => 'Settings', 'url' => ['/user/settings']]
                    ]
                ],
            ],
        ]);