使用laravel-admin配合laravels导出文件时报错 about laravel-s HOT 6 CLOSED

    public function export()
    {
        $filename = $this->getTable().'.csv';

        $headers = [
            'Content-Encoding'    => 'UTF-8',
            'Content-Type'        => 'text/csv;charset=UTF-8',
            'Content-Disposition' => "attachment; filename=\"$filename\"",
        ];

        response()->stream(function () {
            $handle = fopen('php://output', 'w');

            $titles = [];

            $this->chunk(function ($records) use ($handle, &$titles) {
                if (empty($titles)) {
                    $titles = $this->getHeaderRowFromRecords($records);

                    // Add CSV headers
                    fputcsv($handle, $titles);
                }

                foreach ($records as $record) {
                    if ($record) {
                        fputcsv($handle, $this->getFormattedRecord($record));
                    }
                }
            });

            // Close the output stream
            fclose($handle);
        }, 200, $headers)->send();

        exit;
    }