mb-detect-order.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- CREDITS: mowangjuanzi -->
<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>设置/获取 字符编码的检测顺序</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>
   为编码列表 <parameter>encoding</parameter> 设置自动检测字符编码的顺序。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>encoding</parameter></term>
     <listitem>
      <para>
       <parameter>encoding</parameter> 是一个 <type>array</type> 或者逗号分隔的字符编码列表。
       参见<link
       linkend="mbstring.supported-encodings">支持的编码</link>。
      </para>
      <para>
       如果省略 <parameter>encoding</parameter> 或为 &null;，它将返回当前字符编码检测顺序的数组。
      </para>
      <para>
       该设置会影响 <function>mb_detect_encoding</function> 和 <function>mb_send_mail</function>。
      </para>
      <para>
       <literal>mbstring</literal> 当前实现了以下编码检测筛选器。
       如有以下编码列表的无效字节序列，编码的检测将会失败。
      </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>
       对于 <literal>ISO-8859-*</literal>，<literal>mbstring</literal>
       总是检测为 <literal>ISO-8859-*</literal>。
      </para>
      <para>
       对于 <literal>UTF-16</literal>、<literal>UTF-32</literal>、
       <literal>UCS2</literal> 和 <literal>UCS4</literal>，编码检测总是会失败。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   设置编码检测顺序时候，成功时返回 &true;，识别时候返回  &false;。
  </para>
  <para>
   在获取编码检测顺序的时候，会返回排序过的编码数组。
  </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> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
/* 为检测顺序设置枚举列表 */
mb_detect_order("eucjp-win,sjis-win,UTF-8");

/* 通过数组设置检测顺序 */
$ary[] = "ASCII";
$ary[] = "JIS";
$ary[] = "EUC-JP";
mb_detect_order($ary);

/* 显示当前的检测顺序 */
echo implode(", ", mb_detect_order());
?>
]]>
    </programlisting>
   </example>
  </para>
      <para>
       <example>
        <title>案例展示了无效的检测顺序</title>
        <programlisting>
<![CDATA[
; 总是检测为 ISO-8859-1
detect_order = ISO-8859-1, UTF-8

; 总是检测为 UTF-8，由于 ASCII/UTF-7 的值对  UTF-8 是有效的
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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