# Zlib Compression

&reftitle.intro;

This module enables you to transparently read and write gzip (.gz) compressed files, through versions of most of the filesystem functions which work with gzip-compressed files (and uncompressed files, too, but not with sockets).

PHP comes with a fopen-wrapper for `.gz`-files. More information is available in the section about wrappers.compression.

&reference.zlib.setup; &reference.zlib.constants; &reference.zlib.examples; &reference.zlib.reference; &reference.zlib.deflatecontext; &reference.zlib.inflatecontext;