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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="wrappers.compression" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" annotations="verify_info:false" role="stream_wrapper">
<refnamediv>
<refname>zlib://</refname>
<refname>bzip2://</refname>
<refname>zip://</refname>
<refpurpose>Compression Streams</refpurpose>
</refnamediv>
<refsect1 role="description"><!-- {{{ -->
&reftitle.description;
<simpara><filename>compress.zlib://</filename> and <filename>compress.bzip2://</filename></simpara>
<simpara>
<filename>zlib:</filename> works like <function>gzopen</function>, except that the
stream can be used with <function>fread</function> and the other
filesystem functions. This is deprecated due
to ambiguities with filenames containing ':' characters; use
<filename>compress.zlib://</filename> instead.
</simpara>
<simpara>
<filename>compress.zlib://</filename> and
<filename>compress.bzip2://</filename> are equivalent to
<function>gzopen</function> and <function>bzopen</function>
respectively, and operate even on systems that do not support
fopencookie.
</simpara>
<simpara>
<link linkend="book.zip">ZIP extension</link> registers <filename>zip:</filename> wrapper. As of
PHP 7.2.0 and libzip 1.2.0+, support for the passwords for encrypted archives were added, allowing
passwords to be supplied by stream contexts. Passwords can be set using the <literal>'password'</literal>
stream context option.
</simpara>
</refsect1><!-- }}} -->
<refsect1 role="usage"> <!-- {{{ -->
&reftitle.usage;
<itemizedlist>
<listitem><simpara><filename>compress.zlib://file.gz</filename></simpara></listitem>
<listitem><simpara><filename>compress.bzip2://file.bz2</filename></simpara></listitem>
<listitem><simpara><filename>zip://archive.zip#dir/file.txt</filename></simpara></listitem>
</itemizedlist>
</refsect1> <!-- }}} -->
<refsect1 role="options"><!-- {{{ -->
&reftitle.options;
<para>
<table>
<title>Wrapper Summary</title>
<tgroup cols="2">
<thead>
<row>
<entry>Attribute</entry>
<entry>Supported</entry>
</row>
</thead>
<tbody>
<row>
<entry>Restricted by <link linkend="ini.allow-url-fopen">allow_url_fopen</link></entry>
<entry>No</entry>
</row>
<row>
<entry>Allows Reading</entry>
<entry>Yes</entry>
</row>
<row>
<entry>Allows Writing</entry>
<entry>Yes (except <literal>zip://</literal>)</entry>
</row>
<row>
<entry>Allows Appending</entry>
<entry>Yes (except <literal>zip://</literal>)</entry>
</row>
<row>
<entry>Allows Simultaneous Reading and Writing</entry>
<entry>No</entry>
</row>
<row>
<entry>Supports <function>stat</function></entry>
<entry>
No, use the normal <literal>file://</literal> wrapper
to stat compressed files.
</entry>
</row>
<row>
<entry>Supports <function>unlink</function></entry>
<entry>
No, use the normal <literal>file://</literal> wrapper
to unlink compressed files.
</entry>
</row>
<row>
<entry>Supports <function>rename</function></entry>
<entry>No</entry>
</row>
<row>
<entry>Supports <function>mkdir</function></entry>
<entry>No</entry>
</row>
<row>
<entry>Supports <function>rmdir</function></entry>
<entry>No</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</refsect1> <!-- }}} -->
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><xref linkend="context.zlib" /></member>
</simplelist>
</refsect1>
</refentry>
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