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

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<!-- 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 class="union"><type>string</type><type>false</type></type><methodname>readdir</methodname>
   <methodparam choice="opt"><type class="union"><type>resource</type><type>null</type></type><parameter>dir_handle</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   Returns the name of the next entry in the directory. The
   entries 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 entry name on success&return.falseforfailure;.
  </para> 
  &return.falseproblem;
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       <parameter>dir_handle</parameter> is now nullable.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>List all entries 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 "Entries:\n";

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

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

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