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git-svn-id: https://svn.php.net/repository/phpdoc/fr/trunk@222717 c90b9560-bf6c-de11-be94-00142212c4b1
88 lines
2.5 KiB
XML
88 lines
2.5 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.16 $ -->
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<!-- EN-Revision: 1.10 Maintainer: dams Status: ready -->
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<!-- Reviewed: no -->
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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>Réduit itérativement un tableau</refpurpose>
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</refnamediv>
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<refsect1>
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&reftitle.description;
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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>callback</type><parameter>function</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> applique itérativement
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la fonction <parameter>function</parameter> aux éléments du
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tableau <parameter>input</parameter>, de manière à réduire le
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tableau à une valeur simple. Si l'argument optionnel
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<parameter>initial</parameter> est disponible, il sera utilisé pour
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initialiser le processus, ou bien comme valeur finale si le
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tableau est vide.
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Si le tableau est vide et le paramètre <parameter>initial</parameter>
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n'est pas passé, <function>array_reduce</function> retourne &null;.
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</para>
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<para>
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<example>
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<title>Exemple avec <function>array_reduce</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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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($x, "rsum", 1);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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Dans cet exemple, <varname>$b</varname> contiendra <literal>15</literal>,
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<varname>$c</varname> contiendra <literal>1200</literal> (= 10*1*2*3*4*5),
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et <varname>$d</varname> contiendra &one;.
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</para>
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<para>
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Voir aussi
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<function>array_filter</function>,
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<function>array_map</function>,
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<function>array_unique</function> et
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<function>array_count_values</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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