$date_string = date("YmdHis");
// 作業用に
//$y = $this->request->getParameterRef("y");
//HTTPヘッダを設定
header("Expires: Sat, 01 Jan 2000 00:00:00 GMT");
header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
session_cache_limiter("must-revalidate");
header("Content-Disposition: attachment; filename=result_{$date_string}.csv");
header("Content-Type: application/octet-stream; name=result_{$date_string}.csv");