mirror of
https://github.com/php/doc-zh.git
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580b23e287
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@94824 c90b9560-bf6c-de11-be94-00142212c4b1
66 lines
1.8 KiB
XML
Executable File
66 lines
1.8 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.1 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.5 Maintainer: dallas Status: ready -->
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<refentry id="function.array-key-exists">
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<refnamediv>
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<refname>array_key_exists</refname>
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<refpurpose>检查给定的键名或索引是否存在于数组中</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>bool</type><methodname>array_key_exists</methodname>
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<methodparam><type>mixed</type><parameter>key</parameter></methodparam>
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<methodparam><type>array</type><parameter>search</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_key_exists</function> 在给定的 <parameter>key</parameter>
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存在于数组中时返回 &true;。<parameter>key</parameter>
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可以是任何能作为数组索引的值。
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</para>
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<para>
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<example>
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<title><function>array_key_exists</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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$search_array = array("first" => 1, "second" => 4);
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if (array_key_exists("first", $search_array)) {
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echo "The 'first' element is in the array";
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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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<simpara>
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在 PHP 4.0.6 中本函数名为 <function>key_exists</function>。
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</simpara>
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</note>
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<para>
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参见 <function>isset</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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