zip - PHP unzip no external libraries

Is there a php function or class that does not require special
libraries to be compiled with php in order to unzip a
file.

I'm looking for something that processes
the unzip and decompression entirely with php. It seems like all of them require some
external extensions compiled with php. Correct me if I'm
wrong.

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class="normal">Answer

This is
something I've never seen before to be honest. Most hosts will actually install
libraries such as zlib for you if you ask (if they're not already) so you can use the
functionality