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160 lines
4.2 KiB
XML
160 lines
4.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 1db0fccd506aee4f3f9965de592efee18f06d820 Maintainer: yago Status: ready -->
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<refentry xml:id="function.array-reduce" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>array_reduce</refname>
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<refpurpose>Reduce iterativamente una matriz a un solo valor usando una función llamada de retorno</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_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>mixed</type><parameter>initial</parameter><initializer>&null;</initializer></methodparam>
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</methodsynopsis>
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<para>
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<function>array_reduce</function> aplica iterativamente la función
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<parameter>function</parameter> a los elementos de la matriz
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<parameter>input</parameter>, con el propósito de reducir la matriz a
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un solo valor.
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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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La matriz de entrada.
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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>function</parameter></term>
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<listitem>
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<para>
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La función usada como llamada de retorno.
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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>initial</parameter></term>
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<listitem>
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<para>
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Si el parámetro opcional <parameter>inicial</parameter> está
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disponible, éste será usado al comienzo del proceso, o como un
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resultado final en caso de que la matriz esté vacía.
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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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Devuelve el valor resultante.
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</para>
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<para>
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Si la matriz está vacía y no se pasa el parámetro <parameter>initial</parameter>,
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<function>array_reduce</function> devuelve &null;.
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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>5.3.0</entry>
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<entry>
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Cambiado parámetro <parameter>initial</parameter> para permitir <type>mixed</type>, anteriormente <type>integer</type>.
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</entry>
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</row>
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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>Ejemplo de <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, $w)
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{
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$v += $w;
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return $v;
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}
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function rmul($v, $w)
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{
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$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($x, "rsum", "No data to reduce");
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?>
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]]>
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</programlisting>
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<para>
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Esto resultará en que <varname>$b</varname> contenga
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<literal>15</literal>, <varname>$c</varname> contenga
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<literal>1200</literal> (= 10*1*2*3*4*5), y <varname>$d</varname>
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contenga <literal>No datos a reducir</literal>.
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</para>
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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>array_filter</function></member>
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<member><function>array_map</function></member>
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<member><function>array_unique</function></member>
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<member><function>array_count_values</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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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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