{use class='yii\widgets\DetailView'}
{DetailView::widget([
    'model' => $model,
    'attributes' => [
        'id',
        'first_name',
        'phone_number',
        'username',
        'email:email',
        [
            'attribute'=>"roleName",
            'format'=>'raw',
            'value'=> \app\helpers\UserGrid::roles()
        ]
    ]
])}