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git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@327909 c90b9560-bf6c-de11-be94-00142212c4b1
125 lines
3.3 KiB
XML
Executable File
125 lines
3.3 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 315b44a8195bc7e99031e7013dfd57f659039727 Maintainer: HonestQiao Status: ready -->
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<!-- Reviewed: no Maintainer: HonestQiao -->
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<refentry xml:id="function.array-rand" xmlns="http://docbook.org/ns/docbook">
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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 role="description">
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&reftitle.description;
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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><initializer>1</initializer></methodparam>
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</methodsynopsis>
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<para>
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从数组中取出一个或多个随机的单元，并返回随机条目的一个或多个键。
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>input</parameter></term>
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<listitem>
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<para>
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输入的数组。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>num_req</parameter></term>
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<listitem>
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<para>
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指明了你想取出多少个单元。如果指定的数目超过了数组里的数量将会产生一个 <constant>E_WARNING</constant> 级别的错误。
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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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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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>5.2.10</entry>
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<entry>
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The resulting array of keys is no longer shuffled.
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</entry>
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</row>
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&changelog.randomseed;
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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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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<?php
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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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echo $input[$rand_keys[0]] . "\n";
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echo $input[$rand_keys[1]] . "\n";
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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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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>shuffle</function></member>
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</simplelist>
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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:"~/.phpdoc/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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