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64071f2fba
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@95699 c90b9560-bf6c-de11-be94-00142212c4b1
68 lines
2.0 KiB
XML
Executable File
68 lines
2.0 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-rand">
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<refnamediv>
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<refname>array_rand</refname>
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<refpurpose>
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从数组中随机取出一个或多个单元
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</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>mixed</type><methodname>array_rand</methodname>
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<methodparam><type>array</type><parameter>input</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>num_req</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_rand</function> 在你想从数组中取出一个或多个随机的单元时相当有用。它接受
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<parameter>input</parameter> 作为输入数组和一个可选的参数
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<parameter>num_req</parameter>，指明了你想取出多少个单元 － 如果没有指定，默认为 1。
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</para>
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<para>
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如果你只取出一个，<function>array_rand</function>
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返回一个随机单元的键名，否则就返回一个包含随机键名的数组。这样你就可以随机从数组中取出键名和值。
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</para>
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<para>
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不要忘记调用 <function>srand</function> 来撒下随机数发生器的种子。
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</para>
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<para>
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<example>
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<title><function>array_rand</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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srand ((float) microtime() * 10000000);
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$input = array ("Neo", "Morpheus", "Trinity", "Cypher", "Tank");
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$rand_keys = array_rand ($input, 2);
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print $input[$rand_keys[0]]."\n";
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print $input[$rand_keys[1]]."\n";
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]]>
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</programlisting>
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</example>
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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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