Yii2 - navbar dropdown menu

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