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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.realpath">
<refnamediv>
<refname>realpath</refname>
<refpurpose>Returns canonicalized absolute pathname</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>realpath</methodname>
<methodparam><type>string</type><parameter>path</parameter></methodparam>
</methodsynopsis>
<para>
<function>realpath</function> expands all symbolic links and
resolves references to '/./', '/../' and extra '/' characters in
the input <parameter>path</parameter> and return the canonicalized
absolute pathname.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>path</parameter></term>
<listitem>
<para>
The path being checked.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the canonicalized absolute pathname on success. The resulting path
will have no symbolic link, '/./' or '/../' components.
</para>
<para>
<function>realpath</function> returns &false; on failure, e.g. if
the file does not exist.
</para>
<note>
<para>
The running script must have executable permissions on all directories in
the hierarchy, otherwise <function>realpath</function> will return
&false;.
</para>
</note>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.3.0</entry>
<entry>
Prior to this release <function>realpath</function> would not fail on
*BSD systems if only the last last <parameter>path</parameter>
component did not exist.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>realpath</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
chdir('/var/www/');
echo realpath('./../../etc/passwd');
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
/etc/passwd
]]>
</screen>
</example>
<example>
<title><function>realpath</function> on Windows</title>
<para>
On windows <function>realpath</function> will change unix style paths to
windows style.
</para>
<programlisting role="php">
<![CDATA[
<?php
echo realpath('/windows/system32');
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
C:\WINDOWS\System32
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>basename</function></member>
<member><function>dirname</function></member>
<member><function>pathinfo</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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