php-doc-en/reference/dir/functions/readdir.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- splitted from ./en/functions/dir.xml, last change in rev 1.2 -->
<refentry xml:id="function.readdir" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>readdir</refname>
  <refpurpose>Read entry from directory handle</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>readdir</methodname>
   <methodparam choice="opt"><type>resource</type><parameter>dir_handle</parameter></methodparam>
  </methodsynopsis>
  <para>
   Returns the filename of the next file from the directory. The
   filenames are returned in the order in which they are stored by
   the filesystem.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>dir_handle</parameter></term>
     <listitem>
      <para>
       The directory handle <type>resource</type> previously opened
       with <function>opendir</function>. If the directory handle is 
       not specified, the last link opened by <function>opendir</function> 
       is assumed.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the filename on success&return.falseforfailure;.
  </para> 
  &return.falseproblem;
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>List all files in a directory</title>
    <para>
     Please note the fashion in which <function>readdir</function>'s
     return value is checked in the examples below. We are explicitly
     testing whether the return value is identical to (equal to and of
     the same type as--see <link
     linkend="language.operators.comparison">Comparison
     Operators</link> for more information) &false; since otherwise,
     any directory entry whose name evaluates to &false; will stop the
     loop (e.g. a directory named "0").
    </para>
    <programlisting role="php">
<![CDATA[
<?php

if ($handle = opendir('/path/to/files')) {
    echo "Directory handle: $handle\n";
    echo "Files:\n";

    /* This is the correct way to loop over the directory. */
    while (false !== ($file = readdir($handle))) {
        echo "$file\n";
    }

    /* This is the WRONG way to loop over the directory. */
    while ($file = readdir($handle)) {
        echo "$file\n";
    }

    closedir($handle);
}
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>
     List all files in the current directory and strip out <literal>.</literal>
     and <literal>..</literal>
    </title>
    <programlisting role="php">
<![CDATA[
<?php
if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            echo "$file\n";
        }
    }
    closedir($handle);
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>is_dir</function></member>
    <member><function>glob</function></member>
    <member><function>opendir</function></member>
    <member><function>scandir</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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