array-keys.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 5414f72979796d241b9c0b5dc1a9943e707699f2 Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: Luffy, mowangjuanzi -->
<refentry xml:id="function.array-keys" xmlns="http://docbook.org/ns/docbook">
   <refnamediv>
    <refname>array_keys</refname>
    <refpurpose>返回数组中部分的或所有的键名</refpurpose>
   </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="procedural"><type>array</type><methodname>array_keys</methodname>
   <methodparam><type>array</type><parameter>array</parameter></methodparam>
  </methodsynopsis>
  <methodsynopsis role="procedural">
   <type>array</type><methodname>array_keys</methodname>
   <methodparam><type>array</type><parameter>array</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>filter_value</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>strict</parameter><initializer>&false;</initializer></methodparam>
  </methodsynopsis>
    <para>
     <function>array_keys</function> 返回 <parameter>input</parameter>
     数组中的数字或者字符串的键名。
    </para>
    <para>
     如果指定了可选参数 <parameter>filter_value</parameter>，则只返回该值的键名。否则
     <parameter>input</parameter> 数组中的所有键名都会被返回。
    </para>
   </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>input</parameter></term>
     <listitem>
      <para>
       一个数组，包含了要返回的键。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>filter_value</parameter></term>
     <listitem>
      <para>
       如果指定了这个参数，只有包含此值的键才会返回。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>strict</parameter></term>
     <listitem>
      <para>
       判断在搜索的时候是否该使用严格的比较（===）。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回 <parameter>input</parameter> 里的所有键。  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_keys</function> 例子</title>
    <programlisting role="php">
<![CDATA[
<?php
$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));

$array = array("blue", "red", "green", "blue", "blue");
print_r(array_keys($array, "blue"));

$array = array("color" => array("blue", "red", "green"),
               "size"  => array("small", "medium", "large"));
print_r(array_keys($array));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0] => 0
    [1] => color
)
Array
(
    [0] => 0
    [1] => 3
    [2] => 4
)
Array
(
    [0] => color
    [1] => size
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>array_values</function></member>
    <member><function>array_combine</function></member>
    <member><function>array_key_exists</function></member>
    <member><function>array_search</function></member>
   </simplelist>
  </para>
 </refsect1>
  </refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->