PHP XLXSwrite：在现有文件中添加新工作表

I have one excel(.xlsx) file on server now i want to edit that file and add one new blank sheet in it using PHP XLXSwrite.

My code:

$hello = array(array());

$writer = new XLSXWriter();

$writer->writeSheetRow('hello', $hello);
$writer->writeToFile($filename);

This code emptied my file and added new blank sheet in it, but i want my existing data and new sheet in updated file.