yii NAV x下拉

    $menuItems[] = [
        'label' => "<img src='/images/small.jpg'>",
        'url' => ['/site/logout'],
        'linkOptions' => ['class' => 'avatar'],
        'items'=>[
            [
                'label'=>'Home1',
                'url'=>'/site/index'
            ],
            [
                'label'=>'Home2',
                'url'=>'/site/index'
            ]
        ]
    ];
}
echo Nav::widget([
    'options'      => ['class' => 'navbar-nav navbar-right'],
    'items'        => $menuItems,
    'encodeLabels' => false
]);
NavBar::end();