YII2 返回文件

$response = Yii::$app->getResponse();
$response->format = $response::FORMAT_RAW;

$response->getHeaders()->set("Content-Type", "application/vnd.ms-excel");
$response->getHeaders()->set("Content-Disposition", "attachment;filename="EXCEL.xls");
$response->getHeaders()->set("Cache-Control", "max-age=0");

 $r=(new yiidbQuery())
            ->select(["files"])
            ->from("tb")
            ->where(["id" => "11"])
            ->one();
return $r["files"];