Yii2: Find file by file name

yii2

When the actionDownloadFile() function is invoked, it will look for files in the ImportForm\EXAMPLE_DIR directory that have the .filter file extension. If the file path includes the .filter file extension, the path will be returned; otherwise, false will be returned.

public function actionDownloadFile($type)
{
  $filePath = FileHelper::findFiles(ImportForm::EXAMPLE_DIR, ['filter' => function($path) use ($type) {
    if (strpos($path, $type)) {
      return $path;
    }
    return false;
  }]);

  return Yii::$app->response->sendFile(...$filePath);
}