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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.register-shutdown-function" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>register_shutdown_function</refname>
<refpurpose>Register a function for execution on shutdown</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>void</type><methodname>register_shutdown_function</methodname>
<methodparam><type>callback</type><parameter>function</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>parameter</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>...</parameter></methodparam>
</methodsynopsis>
<para>
Registers the function named by <parameter>function</parameter> to be
executed when script processing is complete or when <function>exit</function>
is called.
</para>
<para>
Multiple calls to <function>register_shutdown_function</function> can be
made, and each will be called in the same order as they were registered.
If you call <function>exit</function> within one registered shutdown
function, processing will stop completely and no other registered
shutdown functions will be called.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>function</parameter></term>
<listitem>
<para>
The shutdown function to register.
</para>
<para>
The shutdown functions are called as the part of the request so that
it's possible to send the output from them. There is currently no way
to process the data with output buffering functions in the shutdown
function.
</para>
<para>
Shutdown functions are called after closing all opened output buffers
thus, for example, its output will not be compressed if <link
linkend="ini.zlib.output-compression">zlib.output_compression</link> is
enabled.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>parameter</parameter></term>
<listitem>
<para>
It is possible to pass parameters to the shutdown function by passing
additional parameters.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>...</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.void;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>4.1.0</entry>
<entry>
The shutdown functions are now called as a part of the request.
In earlier versions under Apache, the registered shutdown functions
were called after the request has been completed (including sending
any output buffers), so it was not possible to send output to the
browser using <function>echo</function> or
<function>print</function>, or retrieve the contents of any output
buffers using <function>ob_get_contents</function>.
Headers were also always already sent.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>register_shutdown_function</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
function shutdown()
{
// This is our shutdown function, in
// here we can do any last operations
// before the script is complete.
echo 'Script executed with success', PHP_EOL;
}
register_shutdown_function('shutdown');
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
Typically undefined functions cause fatal errors in PHP, but when the
<parameter>function</parameter> called with
<function>register_shutdown_function</function> is undefined, an error
of level <constant>E_WARNING</constant> is generated instead. Also,
for reasons internal to PHP, this error will refer to
<literal>Unknown</literal> at line #0.
</para>
</note>
<note>
<para>
Working directory of the script can change inside the shutdown function
under some web servers, e.g. Apache.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><link linkend="ini.auto-append-file">auto_append_file</link></member>
<member><function>exit</function></member>
<member>The section on <link
linkend="features.connection-handling">connection handling</link></member>
</simplelist>
</para>
</refsect1>
</refentry>
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