php-doc-en/reference/filesystem/functions/pathinfo.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.pathinfo">
 <refnamediv>
  <refname>pathinfo</refname>
  <refpurpose>Returns information about a file path</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>mixed</type><methodname>pathinfo</methodname>
   <methodparam><type>string</type><parameter>path</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>options</parameter><initializer>PATHINFO_DIRNAME | PATHINFO_BASENAME | PATHINFO_EXTENSION | PATHINFO_FILENAME</initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pathinfo</function> returns information about
   <parameter>path</parameter>: either an associative array or a string,
   depending on <parameter>options</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>path</parameter></term>
     <listitem>
      <para>
       The path to be parsed.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>options</parameter></term>
     <listitem>
      <para>
       If present, specifies a specific element to be returned; one of
       <constant>PATHINFO_DIRNAME</constant>,
       <constant>PATHINFO_BASENAME</constant>,
       <constant>PATHINFO_EXTENSION</constant> or
       <constant>PATHINFO_FILENAME</constant>.
      </para>
      <para>If <parameter>options</parameter> is not specified, returns all
       available elements.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   If the <parameter>options</parameter> parameter is not passed, an
   associative <type>array</type> containing the following elements is
   returned:
   <literal>dirname</literal>, <literal>basename</literal>,
   <literal>extension</literal> (if any), and <literal>filename</literal>.
  </para>
  <note>
   <para>
    If the <parameter>path</parameter> has more than one extension,
    <constant>PATHINFO_EXTENSION</constant> returns only the last one and
    <constant>PATHINFO_FILENAME</constant> only strips the last one.
    (see first example below).
   </para>
  </note>
  <note>
   <para>
    If the <parameter>path</parameter> does not have an extension, no
    <literal>extension</literal> element will be returned
    (see second example below).
   </para>
  </note>
  <para>
   If <parameter>options</parameter> is present, returns a
   <type>string</type> containing the requested element.
  </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>5.2.0</entry>
       <entry>
        The <constant>PATHINFO_FILENAME</constant> constant was added.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pathinfo</function> Example</title>
    <programlisting role="php">
<![CDATA[
<?php
$path_parts = pathinfo('/www/htdocs/inc/lib.inc.php');

echo $path_parts['dirname'], "\n";
echo $path_parts['basename'], "\n";
echo $path_parts['extension'], "\n";
echo $path_parts['filename'], "\n"; // since PHP 5.2.0
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
/www/htdocs/inc
lib.inc.php
php
lib.inc
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title><function>pathinfo</function> example showing difference between null and no extension</title>
    <programlisting role="php">
<![CDATA[
<?php
$path_parts = pathinfo('/path/emptyextension.');
var_dump($path_parts['extension']);

$path_parts = pathinfo('/path/noextension');
var_dump($path_parts['extension']);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
string(0) ""

Notice: Undefined index: extension in test.php on line 6
NULL
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    For information on retrieving the current path info, read
    the section on <link linkend="language.variables.predefined">
    predefined reserved variables</link>.
   </para>
  </note>
  <note>
   <para>
    <function>pathinfo</function> is locale aware, so for it to parse a path
    containing multibyte characters correctly, the matching locale must be set using
    the <function>setlocale</function> function.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>dirname</function></member>
    <member><function>basename</function></member>
    <member><function>parse_url</function></member>
    <member><function>realpath</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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