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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.flush">
<refnamediv>
<refname>flush</refname>
<refpurpose>Flush system output buffer</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>void</type><methodname>flush</methodname>
<void/>
</methodsynopsis>
<para>
Flushes the system write buffers of PHP and the backend used by PHP
(e.g.: CGI, a web server).
In a command line environment <function>flush</function>
will attempt to flush the contents of the buffers only
whereas in a web context headers and the contents of the buffers are flushed.
</para>
<note>
<simpara>
<function>flush</function> may not be able to override
the buffering scheme of the web server
and it has no effect on any client-side buffering in the browser.
</simpara>
</note>
<note>
<simpara>
This function does not have any effect on user level output handlers
such as those started by <function>ob_start</function>
or <function>output_add_rewrite_var</function>.
</simpara>
</note>
<warning>
<simpara>
<function>flush</function> can interfere with output handlers
that set and send headers in a web context (e.g. <function>ob_gzhandler</function>)
by sending headers before these handlers can do so.
</simpara>
</warning>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
&no.function.parameters;
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.void;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.4.0</entry>
<entry>
Flushing headers without a body will now succeed in FastCGI.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>ob_flush</function></member>
<member><function>ob_clean</function></member>
<member><function>ob_end_flush</function></member>
<member><function>ob_end_clean</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
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vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
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