Pclzip Problem

hii i am using
PclZip Overview
this for zipping data on my site
when use click on zip
that pass a url of file which it give back to user in zip format
for example url i give is

But problem with this is that when folder2 zip and then we extract folder2 that also has other directory folders in it which we give in url
we will extract folder2 we find in


how i can i remove other folder directories from my zip folder

is there someone really know about pclzip
i already has asked this question few time ago but no answer Please help if any one really know