zlib(5) - phpMan

Compress::Raw::Zlib (3pm) - Low-Level Interface to zlib compression library
Compress::Zlib (3pm) - Interface to zlib compression library
IO::Uncompress::AnyInflate (3pm) - Uncompress zlib-based (zip, gzip) file/buffer
IO::Zlib (3pm)       - IO:: style interface to Compress::Zlib