archived-doc-zh/reference/strings/functions/strtolower.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.strtolower">
 <refnamediv>
  <refname>strtolower</refname>
  <refpurpose>将字符串转化为小写</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>strtolower</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
  </methodsynopsis>
  <para>
  将 <parameter>string</parameter> 中所有的 ASCII 字母字符转换为小写并返回。
  </para>
  <para>
   <literal>"A"</literal>（0x41）到 <literal>"Z"</literal>（0x5a）范围内的字节会通过将每个字节值加 32 转为相应的小写字母。
  </para>
  <para>
   这可用于转换用 UTF-8 编码的字符串中的 ASCII 字符，但会忽略多字节 UTF-8 字符。要转换多字节非
   ASCII 字符，请使用 <function>mb_strtolower</function>。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       输入字符串。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回转换后的小写字符串。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &strings.changelog.ascii-case-conversion;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>strtolower</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$str = "Mary Had A Little Lamb and She LOVED It So";
$str = strtolower($str);
echo $str; // 打印 mary had a little lamb and she loved it so
?>
]]>
    </programlisting>
   </example>   
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &note.bin-safe;
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>strtoupper</function></member>
    <member><function>ucfirst</function></member>
    <member><function>ucwords</function></member>
    <member><function>mb_strtolower</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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