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64071f2fba
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@95699 c90b9560-bf6c-de11-be94-00142212c4b1
118 lines
2.7 KiB
XML
Executable File
118 lines
2.7 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.2 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.4 Maintainer: dallas Status: ready -->
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<refentry id="function.array-keys">
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<refnamediv>
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<refname>array_keys</refname>
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<refpurpose>返回数组中所有的键名</refpurpose>
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</refnamediv>
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<refsect1>
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<title>说明</title>
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<methodsynopsis>
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<type>array</type><methodname>array_keys</methodname>
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<methodparam><type>array</type><parameter>input</parameter></methodparam>
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<methodparam choice="opt"><type>mixed</type><parameter>
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search_value
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</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_keys</function> 返回 <parameter>input</parameter>
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数组中的数字或者字符串的键名。
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</para>
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<para>
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如果指定了可选参数 <parameter>search_value</parameter>，则只返回该值的键名。否则
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<parameter>input</parameter> 数组中的所有键名都会被返回。
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</para>
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<para>
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<example>
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<title><function>array_keys</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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$array = array (0 => 100, "color" => "red");
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print_r(array_keys ($array));
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$array = array ("blue", "red", "green", "blue", "blue");
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print_r(array_keys ($array, "blue"));
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$array = array ("color" => array("blue", "red", "green"),
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"size" => array("small", "medium", "large"));
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print_r(array_keys ($array));
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]]>
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</programlisting>
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<para>
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以上程序输出为：
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<screen>
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<![CDATA[
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Array
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(
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[0] => 0
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[1] => color
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)
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Array
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(
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[0] => 0
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[1] => 3
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[2] => 4
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)
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Array
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(
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[0] => color
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[1] => size
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)
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]]>
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</screen>
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</para>
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</example>
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</para>
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<note>
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<para>
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本函数是 PHP 4 新增的，下面是仍在使用 PHP 3 的用户的实现方法：
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<example>
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<title>
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<function>array_keys</function> 在 PHP 3 中的实现
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</title>
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<programlisting role="php">
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<![CDATA[
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function array_keys ($arr, $term="") {
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$t = array();
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while (list($k,$v) = each($arr)) {
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if ($term && $v != $term) {
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continue;
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}
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$t[] = $k;
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}
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return $t;
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}
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]]>
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</programlisting>
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</example>
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</para>
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</note>
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<para>
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参见 <function>array_values</function>。
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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