yii中更改布局位置summary item pager

示例代码如下：t通过‘layout’来指定他们的位置。

 <?= GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $searchModel,
        'columns' => [
//            ['class' => 'yii\grid\SerialColumn'],//去掉默认序列

            'id',
            [
               'attribute'=>'channelId',
                'value'=>function($model){
                    return \backend\models\Channel::findOne($model->channelId)['name'];
                }
            ],
            [
                'attribute'=>'channelId',
                'value'=>function($model){
                    return \backend\models\Comic::findOne($model->channelId)['name'];
                }
            ],
            'created_at',

        ],
        'layout'=>"{items}\n{summary}\n{pager}"
    ]); ?>