一些好的代码段

public function export($tpl, $filename, $header, $columnWidth)
    {
        $data = [];
        $headerFields = array_keys($header);
        $headerTitles = array_values($header);

        $templateDataItem = $this->getDataItemByTpl($tpl);
        $result = TemplateCatService::S()->getTemplateCatKVByTpl($tpl);

        foreach ($templateDataItem as $key => &$dataItem) {
            $dataItem->unpack();
            $dataItem->catName = $result[$dataItem->catId];
            $dataItem->bCatName = $result[$dataItem->bCatId];
            $dataItem->labels = implode(",", $dataItem->labels);
            //下面的代码是我之前没有想到的
            foreach ($headerFields as $field) {
                $data[$key][$field] = $dataItem->$field;
            }
        }
        return \Util::export($headerTitles, $data, $filename, $columnWidth);
    }