<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.mb-detect-order" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>mb_detect_order</refname>
  <refpurpose>Set/Get character encoding detection order</refpurpose>
 </refnamediv>
   
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>bool</type></type><methodname>mb_detect_order</methodname>
   <methodparam choice="opt"><type class="union"><type>array</type><type>string</type><type>null</type></type><parameter>encoding</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   Sets the automatic character
   encoding detection order to <parameter>encoding</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>encoding</parameter></term>
     <listitem>
      <para>
       <parameter>encoding</parameter> is an <type>array</type> or 
       comma separated list of character encoding. See <link
       linkend="mbstring.supported-encodings">supported encodings</link>.
      </para>
      <para>
       If <parameter>encoding</parameter> is omitted or &null;, it returns
       the current character encoding detection order as array.
      </para>
      <para>
       This setting affects <function>mb_detect_encoding</function> and
       <function>mb_send_mail</function>.
      </para>
      <para>
       <literal>mbstring</literal> currently implements the following
       encoding detection filters. If there is an invalid byte sequence
       for the following encodings, encoding detection will fail.
      </para>
      <simpara>
       <literal>UTF-8</literal>, <literal>UTF-7</literal>,
       <literal>ASCII</literal>,
       <literal>EUC-JP</literal>,<literal>SJIS</literal>,
       <literal>eucJP-win</literal>, <literal>SJIS-win</literal>,
       <literal>JIS</literal>, <literal>ISO-2022-JP</literal> 
      </simpara>
      <para>
       For <literal>ISO-8859-*</literal>, <literal>mbstring</literal>
       always detects as <literal>ISO-8859-*</literal>.
      </para>
      <para>
       For <literal>UTF-16</literal>, <literal>UTF-32</literal>,
       <literal>UCS2</literal> and <literal>UCS4</literal>, encoding
       detection will fail always.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   When setting the encoding detection order, &true; is returned on success or &false; on failure.
  </para>
  <para>
   When getting the encoding detection order, an ordered array of the encodings is returned.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &mbstring.changelog.encoding-nullable;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mb_detect_order</function> examples</title>
    <programlisting role="php">
<![CDATA[
<?php
/* Set detection order by enumerated list */
mb_detect_order("eucjp-win,sjis-win,UTF-8");

/* Set detection order by array */
$ary[] = "ASCII";
$ary[] = "JIS";
$ary[] = "EUC-JP";
mb_detect_order($ary);

/* Display current detection order */
echo implode(", ", mb_detect_order());
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Example showing useless detect orders</title>
    <programlisting>
<![CDATA[
; Always detect as ISO-8859-1
detect_order = ISO-8859-1, UTF-8

; Always detect as UTF-8, since ASCII/UTF-7 values are 
; valid for UTF-8
detect_order = UTF-8, ASCII, UTF-7
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mb_internal_encoding</function></member>
    <member><function>mb_http_input</function></member>
    <member><function>mb_http_output</function></member>
    <member><function>mb_send_mail</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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