Auto unzip uploaded file

[Norbert Wenzel <mail@xxxxxxxxxxxx>]

I know a script (it's a webgallery) where you upload your images.zip 
with any amount of images in it. After uploading the .zip get unzipped 
and the images will be placed into the gallery.

How did they unzip (or better, how is it possible to unzip) the file 
with php? and is it possible to extract let's say .rar or any other 
common format as well?


thanks for your suggestions,
norbert

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