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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.3 $ -->
<refentry id="function.set-include-path">
<refnamediv>
<refname>set_include_path</refname>
<refpurpose>
Sets the include_path configuration option
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>string</type><methodname>set_include_path</methodname>
<methodparam><type>string</type><parameter>new_include_path</parameter></methodparam>
</methodsynopsis>
<simpara>
Sets the <link linkend="ini.include-path">include_path</link>
configuration option for the duration of the script. Returns the old
<link linkend="ini.include-path">include_path</link> on success or
&false; on failure.
</simpara>
<para>
<example>
<title><function>set_include_path</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Works as of PHP 4.3.0
set_include_path('/inc');
// Works in all PHP versions
ini_set('include_path', '/inc');
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>Adding to the include path</title>
<para>
Making use of the <constant>PATH_SEPARATOR</constant>
constant, it is possible to extend the include path
regardless of the operating system.
</para>
<para>
In this example we add <filename>/usr/lib/pear</filename>
to the end of the existing <literal>include_path</literal>.
</para>
<programlisting role="php">
<![CDATA[
<?php
$path = '/usr/lib/pear';
set_include_path(get_include_path() . PATH_SEPARATOR . $path);
?>
]]>
</programlisting>
</example>
</para>
<simpara>
See also <function>ini_set</function>,
<function>get_include_path</function>,
<function>restore_include_path</function>, and
<function>include</function>.
</simpara>
</refsect1>
</refentry>
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