* @param $fileName The file name we shall pass to fopen()
* @param $mode The output mode ('w', 'a' are valid)
* @throws FileIsEmptyException If the provided file name is empty.
* @param $fileName The file name we shall pass to fopen()
* @param $mode The output mode ('w', 'a' are valid)
* @throws FileIsEmptyException If the provided file name is empty.