Source of: /manual/en/intro.zlib.php
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<div id="intro.zlib" class="preface">
<h1 class="title">Introduction</h1>
<p class="para">
This module enables you to transparently read and write
gzip (.gz) compressed files, through versions of most of
the <a href="book.filesystem.php" class="link">filesystem</a> functions
which work with gzip-compressed files (and uncompressed files,
too, but not with sockets).
</p>
<blockquote><p><b class="note">Note</b>:
Version 4.0.4 introduced a fopen-wrapper for <var class="filename">.gz</var>-files, so that
you can use a special <var class="filename">zlib:</var> URL to access
compressed files transparently using the normal f*() file access
functions if you prefix the filename or path with
<var class="filename">zlib:</var> when calling <a href="function.fopen.php" class="function">fopen()</a>. This
feature requires a C runtime library that provides the
<i>fopencookie()</i> function. Up to now the GNU libc
seems to be the only library that provides this feature.
<br />
In PHP 4.3.0, <var class="filename">zlib:</var> has been changed to
<var class="filename">compress.zlib://</var> to prevent ambiguities with
filenames containing '<i>:</i>' characters. The
<i>fopencookie()</i> function is no longer required.
More information is available in the section about
<a href="wrappers.compression.php" class="xref">Compression Streams</a>.
<br />
</p></blockquote>
</div><?php manual_footer(); ?>
