if (Yii::$app->user->isGuest) {
    $menuItems[] = ['label' => Html::tag('i', '', ['class' => 'fa fa-sign-in fa-lg']) . ' ' . Yii::t('adminlte', 'Login'), 'url' => ['/site/login']];
} else {
    $baseimg = Yii::$app->session->get('user.avatar60');
    $menuItems[] = ['label' => $user->username . ' ' .  Html::img($baseimg, $options = ['class'=>'img-rounded', 'aria-expanded'=>'false']),