在gridview yii2中使用implode(Using implode in gridview yii2)

 我有gridview 
 
[

            'value' => function($data){
            $sum = '';
            foreach ($data->orderInfo as $request){
                $str = ($request->order_items_offer_name);


                $sum .= ($str);
            }

            return implode(',',array($sum)) ;
        }], 
 
 但是数据之间没有逗号。 

I have in gridview 
 
[

            'value' => function($data){
            $sum = '';
            foreach ($data->orderInfo as $request){
                $str = ($request->order_items_offer_name);


                $sum .= ($str);
            }

            return implode(',',array($sum)) ;
        }], 
 
But there is no comma between data.

原文：https://stackoverflow.com/questions/41449318