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git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@95699 c90b9560-bf6c-de11-be94-00142212c4b1
82 lines
2.3 KiB
XML
Executable File
82 lines
2.3 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-reduce">
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<refnamediv>
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<refname>array_reduce</refname>
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<refpurpose>
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用回调函数迭代地将数组简化为单一的值
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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_reduce</methodname>
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<methodparam><type>array</type><parameter>input</parameter></methodparam>
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<methodparam><type>mixed</type><parameter>callback</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>initial</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_reduce</function> 将回调函数
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<parameter>callback</parameter> 迭代地作用到
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<parameter>input</parameter> 数组中的每一个单元中，从而将数组简化为单一的值。如果指定了可选参数
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<parameter>initial</parameter>，该参数将被当成是数组中的第一个值来处理，或者如果数组为空的话就作为最终返回值。
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</para>
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<para>
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<example>
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<title><function>array_reduce</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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function rsum($v, $w) {
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$v += $w;
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return $v;
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}
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function rmul($v, $w) {
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$v *= $w;
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return $v;
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}
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$a = array(1, 2, 3, 4, 5);
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$x = array();
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$b = array_reduce($a, "rsum");
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$c = array_reduce($a, "rmul", 10);
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$d = array_reduce($x, "rsum", 1);
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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这将使 <varname>$b</varname> 的值为
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<literal>15</literal>，<varname>$c</varname> 的值为
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<literal>1200</literal>（= 1*2*3*4*5*10），以及
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<varname>$d</varname> 的值为 <literal>1</literal>。
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</para>
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<para>
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参见 <function>array_filter</function> 和 <function>array_map</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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