Upload and unpack ZIP-archive

[eluser]Christoffer[/eluser]
Hey all,

I was checking put CodeIgniters built in ZIP-class for working with zipping and unzipping. Sadly it doesn't support the latter so I wonder if there is a solid third party library for unpacking a zip archive in a defined folder.

It is supposed to be used for syncing files and therefore I need it to be able to overwrite existing files and create the non-existing files and folders.

Also it needs to be used without PEAR or other add-ons.

Thank you