Not extracting html, css or js files?

[ToNyOyO]

$zipper->make($request->file('zipfile'))->extractTo($directoryPath.$detailFolder);

This is the content of my ZIP:

And this is what actually gets extracted:

All the folders have files in them. Why might this be happening?

[ToNyOyO]

It's because the files were empty...

Is that a PHP thing (that I've never noticed)?