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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@78202 c90b9560-bf6c-de11-be94-00142212c4b1
132 lines
2.9 KiB
XML
132 lines
2.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.1 $ -->
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<reference id="ref.zlib">
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<title>Zlib Compression Functions</title>
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<titleabbrev>Zlib</titleabbrev>
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<partintro>
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<para>
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This module uses the functions of <ulink
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url="&url.zlib;">zlib</ulink> by Jean-loup Gailly and Mark Adler to
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transparently read and write gzip (.gz) compressed files. You have
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to use a zlib version >= 1.0.9 with this module.
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</para>
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<para>
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This module contains versions of most of the <link
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linkend="ref.filesystem">filesystem</link> functions which work
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with gzip-compressed files (and uncompressed files, too, but not
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with sockets).
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</para>
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<note>
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<para>
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Version 4.0.4 introduces a fopen-wrapper for .gz-files, so that
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you can use a special 'zlib:' URL to access compressed files
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transparently using the normal f*() file access functions if you
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prepend the filename or path with a 'zlib:' prefix when calling
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<function>fopen</function>.
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</para>
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<para>
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In version 4.3.0, this special prefix has been changed to 'zlib://'
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to prevent ambiguities with filenames containing ':'.
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</para>
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<para>
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This feature requires a C runtime library that provides the
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<literal>fopencookie()</literal> function. To my current
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knowledge the GNU libc is the only library that provides
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this feature.
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</para>
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</note>
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<section id="zlib-example">
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<title>Small code example</title>
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<para>
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Opens a temporary file and writes a test string to it, then it
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prints out the content of this file twice.
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</para>
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<example>
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<title>Small Zlib Example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$filename = tempnam ('/tmp', 'zlibtest').'.gz';
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print "<html>\n<head></head>\n<body>\n<pre>\n";
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$s = "Only a test, test, test, test, test, test, test, test!\n";
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// open file for writing with maximum compression
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$zp = gzopen($filename, "w9");
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// write string to file
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gzwrite($zp, $s);
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// close file
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gzclose($zp);
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// open file for reading
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$zp = gzopen($filename, "r");
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// read 3 char
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print gzread($zp, 3);
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// output until end of the file and close it.
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gzpassthru($zp);
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print "\n";
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// open file and print content (the 2nd time).
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if (readgzfile($filename) != strlen($s)) {
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echo "Error with zlib functions!";
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}
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unlink($filename);
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print "</pre>\n</h1></body>\n</html>\n";
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?>
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]]>
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</programlisting>
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</example>
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</section>
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</partintro>
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&reference.zlib.functions;
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</reference>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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