How can use anonymous functions in twig?

[yii-bot]

This issue has originally been reported by @RooTooZ at yiisoft/yii2#8401.
Moved here by @cebe.

---

for example, I want to change the button setting

echo \yii\grid\GridView::widget([
     'id'=>'loggrid',
    'dataProvider' => $dp,
    'columns' => [
      ....
       [
           'class' => \yii\grid\ActionColumn::className(),
           'buttons'=>[
                  'view'=>function ($url, $model) { # how can use this option in twig???
                        $customurl=Yii::$app->getUrlManager()->createUrl(['log/view','id'=>$model['id']]); 
                        return \yii\helpers\Html::a( '<span class="glyphicon glyphicon-eye-open"></span>', $customurl,
                                                ['title' => Yii::t('yii', 'View'), 'data-pjax' => '0']);
               }
            ],
           'template'=>'{view}  {delete}',
       ]
    ],
]);

[antgubarev]

You can not use anonymous function in twig template. See docs https://github.com/yiisoft/yii2-twig/blob/master/docs/guide/layouts-and-widgets.md