Source of: /manual/en/wrappers.compression.php
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<div id="wrappers.compression" class="section">
<h2 class="title">Compression Streams</h2>
<p class="simpara"><var class="filename">zlib:</var> PHP 4.0.4 - PHP 4.2.3 (systems with fopencookie only)</p>
<p class="simpara"><var class="filename">compress.zlib://</var> and <var class="filename">compress.bzip2://</var> PHP 4.3.0 and up</p>
<ul class="itemizedlist">
<li class="listitem"><span class="simpara"><var class="filename">zlib:</var></span></li>
<li class="listitem"><span class="simpara"><var class="filename">compress.zlib://</var></span></li>
<li class="listitem"><span class="simpara"><var class="filename">compress.bzip2://</var></span></li>
</ul>
<p class="simpara">
<var class="filename">zlib:</var> works like <a href="function.gzopen.php" class="function">gzopen()</a>, except that the
stream can be used with <a href="function.fread.php" class="function">fread()</a> and the other
filesystem functions. This is deprecated as of PHP 4.3.0 due
to ambiguities with filenames containing ':' characters; use
<var class="filename">compress.zlib://</var> instead.
</p>
<p class="simpara">
<var class="filename">compress.zlib://</var> and
<var class="filename">compress.bzip2://</var> are equivalent to
<a href="function.gzopen.php" class="function">gzopen()</a> and <a href="function.bzopen.php" class="function">bzopen()</a>
respectively, and operate even on systems that do not support
fopencookie.
</p>
<p class="para">
</p><table class="doctable table">
<caption><b>Wrapper Summary</b></caption>
<thead valign="middle">
<tr valign="middle">
<th>Attribute</th>
<th>Supported</th>
</tr>
</thead>
<tbody valign="middle" class="tbody">
<tr valign="middle">
<td align="left">Restricted by <a href="filesystem.configuration.php#ini.allow-url-fopen" class="link">allow_url_fopen</a></td>
<td align="left">No</td>
</tr>
<tr valign="middle">
<td align="left">Allows Reading</td>
<td align="left">Yes</td>
</tr>
<tr valign="middle">
<td align="left">Allows Writing</td>
<td align="left">Yes</td>
</tr>
<tr valign="middle">
<td align="left">Allows Appending</td>
<td align="left">Yes</td>
</tr>
<tr valign="middle">
<td align="left">Allows Simultaneous Reading and Writing</td>
<td align="left">No</td>
</tr>
<tr valign="middle">
<td align="left">Supports <a href="function.stat.php" class="function">stat()</a></td>
<td align="left">
No, use the normal <i>file://</i> wrapper
to stat compressed files.
</td>
</tr>
<tr valign="middle">
<td align="left">Supports <a href="function.unlink.php" class="function">unlink()</a></td>
<td align="left">
No, use the normal <i>file://</i> wrapper
to unlink compressed files.
</td>
</tr>
<tr valign="middle">
<td align="left">Supports <a href="function.rename.php" class="function">rename()</a></td>
<td align="left">No</td>
</tr>
<tr valign="middle">
<td align="left">Supports <a href="function.mkdir.php" class="function">mkdir()</a></td>
<td align="left">No</td>
</tr>
<tr valign="middle">
<td align="left">Supports <a href="function.rmdir.php" class="function">rmdir()</a></td>
<td align="left">No</td>
</tr>
</tbody>
</table>
<p>
</p>
<p class="para">
<a href="book.zip.php" class="link">ZIP extension</a> registers <var class="filename">zip:</var> wrapper.
</p>
</div><?php manual_footer(); ?>
