Giltros en gridview

# views/user/index.php
<?= GridView::widget([
'dataProvider' => $dataProvider,
'filterModel' => $searchModel,
'columns' => [
['class' => 'yii\grid\SerialColumn'],
'id',
'username',
'email:email',
[
'attribute' => 'type',
'filter' => ['public' => 'Public', 'author' => 'Author',
'admin' => 'Admin'],
],
['class' => 'yii\grid\ActionColumn'],
],
]); ?>