yii2 ActiveForm::begin的区分

上传图片：   $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]);

<?= _GridView::widget([
    'dataProvider' => $dataProvider,
    'filterModel' => $searchModel,
    'columns' => $gridColumns,

]);
?>
这个部分对内容折行显示有影响。

[
    'attribute'=>'lidname',
    'headerOptions' => ['width' => '200'],
    'value'=>function ($model, $key, $index, $widget) {
        if(!empty($model->lidname)){
            if(!empty($model->lidname)){
                $teachers = explode(',',$model->lidname);
                $teacher= [];
                foreach($teachers as $val){
                    $teacher[] = $val;
                }
                $teacher = implode(',<br />',$teacher);
                return $teacher;
            }else{
                return '未设置';
            }
        }
    },
    'vAlign'=>'middle',
    'format'=>'raw',
    'width'=>'100px',
    'noWrap'=>true
],