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171 lines
5.0 KiB
XML
171 lines
5.0 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: d1df62fe77b6cb0676d064e8e63ee2c3304d4260 Maintainer: yuanyuqiang Status: ready -->
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<!-- CREDITS: Luffy,mowangjuanzi -->
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<!-- Reviewed: no -->
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<chapter xml:id="array.sorting" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>对数组进行排序</title>
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<para>
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PHP 有一些用来排序数组的函数，
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这个文档会把它们列出来。
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</para>
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<para>
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主要区别有：
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</para>
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<para>
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<simplelist>
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<member>
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有些函数基于 <type>array</type> 的键来排序，
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而其他的基于值来排序的：<literal>$array['key'] = 'value';</literal>。
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</member>
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<member>
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排序之后键和值之间的关联关系是否能够保持，
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是指排序之后数组的键可能
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会被重置为数字型的（0,1,2 ...）。
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</member>
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<member>
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排序的顺序有：字母表顺序， 升序（由低到高），
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降序（由高到低），数字排序，自然排序，随机顺序或者用户自定义排序。
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</member>
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<member>
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注意：下列的所有排序函数都是直接作用于数组本身，
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而不是返回一个新的有序的数组。
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</member>
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<member>
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以下函数对于数组中相等的元素，会保留原有的排序。
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在 PHP 8.0.0 之前，它们排序后的顺序是未定义的（也即相等元素之间的顺序是不稳定的）。
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</member>
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</simplelist>
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</para>
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<para>
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<table>
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<title>排序函数属性</title>
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<tgroup cols="5">
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<thead>
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<row>
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<entry>函数名称</entry>
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<entry>排序依据</entry>
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<entry>数组索引键保持</entry>
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<entry>排序的顺序</entry>
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<entry>相关函数</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><function>array_multisort</function></entry>
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<entry>值</entry>
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<entry><type>string</type> 键保持不变，<type>int</type> 键重新索引</entry>
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<entry>第一个数组或者由选项指定</entry>
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<entry><function>array_walk</function></entry>
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</row>
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<row>
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<entry><function>asort</function></entry>
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<entry>值</entry>
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<entry>是</entry>
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<entry>升序</entry>
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<entry><function>arsort</function></entry>
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</row>
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<row>
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<entry><function>arsort</function></entry>
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<entry>值</entry>
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<entry>是</entry>
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<entry>降序</entry>
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<entry><function>asort</function></entry>
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</row>
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<row>
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<entry><function>krsort</function></entry>
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<entry>键</entry>
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<entry>是</entry>
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<entry>降序</entry>
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<entry><function>ksort</function></entry>
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</row>
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<row>
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<entry><function>ksort</function></entry>
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<entry>键</entry>
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<entry>是</entry>
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<entry>升序</entry>
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<entry><function>krsort</function></entry>
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</row>
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<row>
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<entry><function>natcasesort</function></entry>
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<entry>值</entry>
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<entry>是</entry>
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<entry>自然排序，大小写不敏感</entry>
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<entry><function>natsort</function></entry>
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</row>
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<row>
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<entry><function>natsort</function></entry>
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<entry>值</entry>
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<entry>是</entry>
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<entry>自然排序</entry>
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<entry><function>natcasesort</function></entry>
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</row>
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<row>
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<entry><function>rsort</function></entry>
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<entry>值</entry>
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<entry>否</entry>
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<entry>降序</entry>
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<entry><function>sort</function></entry>
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</row>
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<row>
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<entry><function>shuffle</function></entry>
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<entry>值</entry>
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<entry>否</entry>
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<entry>随机</entry>
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<entry><function>array_rand</function></entry>
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</row>
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<row>
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<entry><function>sort</function></entry>
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<entry>值</entry>
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<entry>否</entry>
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<entry>升序</entry>
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<entry><function>rsort</function></entry>
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</row>
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<row>
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<entry><function>uasort</function></entry>
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<entry>值</entry>
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<entry>是</entry>
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<entry>由用户定义</entry>
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<entry><function>uksort</function></entry>
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</row>
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<row>
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<entry><function>uksort</function></entry>
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<entry>键</entry>
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<entry>是</entry>
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<entry>由用户定义</entry>
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<entry><function>uasort</function></entry>
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</row>
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<row>
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<entry><function>usort</function></entry>
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<entry>值</entry>
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<entry>否</entry>
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<entry>由用户定义</entry>
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<entry><function>uasort</function></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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</chapter>
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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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