App\Http\Controllers\ExportController::returnCSV PHP Method

    private function returnCSV($request, $fileName)
    {
        $data = $this->getData($request);
        return Excel::create($fileName, function ($excel) use($data) {
            $excel->sheet('', function ($sheet) use($data) {
                $sheet->loadView('export', $data);
            });
        })->download('csv');
    }