php-doc-en/functions/recode.xml

 <reference id="ref.recode">
  <title>GNU Recode functions</title>
  <titleabbrev>Recode</titleabbrev>

  <partintro>
   <para>
    This module contains an interface to the GNU Recode library,
    version 3.5. To be able to use the functions defined in this
    module you must compile you PHP interpreter using the --with-recode
    option. In order to do so, you must have GNU Recode 3.5 or higher
    installed on your system.
   </para>
   <para>
    The GNU Recode library converts files between various coded
    character sets and surface encodings. When this cannot be
    achieved exactly, it may get rid of the offending characters or
    fall back on approximations. The library recognises or produces
    nearly 150 different character sets and is able to convert files
    between almost any pair. Most RFC 1345 character sets are supported.
   </para>
  </partintro>

  <refentry id="function.recode-string">
   <refnamediv>
    <refname>recode_string</refname>
    <refpurpose>Recode a string according to a recode request.</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>string <function>recode_string</function></funcdef>
     <paramdef>string <parameter>request</parameter></paramdef>
     <paramdef>string <parameter>string</parameter></paramdef>
    </funcsynopsis>
    <para>
     Recode the string <parameter>string</parameter> according to
     the recode request <parameter>request</parameter>. Returns
     FALSE, if unable to comply, TRUE otherwise.</para>
    <para>
     A simple recode request may be &quot;lat1..iso646-de&quot;.
     See also the GNU Recode documentation of your installation
     for detailed instructions about recode requests.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.recode">
   <refnamediv>
    <refname>recode</refname>
    <refpurpose>Recode a string according to a recode request.</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>string <function>recode_string</function></funcdef>
     <paramdef>string <parameter>request</parameter></paramdef>
     <paramdef>string <parameter>string</parameter></paramdef>
    </funcsynopsis>
    <simpara>
     This is an alias for <function>recode_string</function>. It
     has been added in PHP4.
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.recode-file">
   <refnamediv>
    <refname>recode_file</refname>
    <refpurpose>Recode from file to file according to recode request.</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>bool <function>recode_file</function></funcdef>
     <paramdef>int <parameter>input</parameter></paramdef>
     <paramdef>int <parameter>output</parameter></paramdef>
    </funcsynopsis>
    <para>
     Recode the file referenced by file handle <parameter>input</parameter> 
     into the file referenced by file handle <parameter>output</parameter>
     according to the recode request <parameter>request</parameter>. 
     Returns FALSE, if unable to comply, TRUE otherwise.</para>
    <para>
     This function does not currently process filehandles referencing
     remote files (URLs). Both filehandles must refer to local files.
    </para>
   </refsect1>
  </refentry>
 </reference>

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