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git-svn-id: https://svn.php.net/repository/phpdoc/es/trunk@349887 c90b9560-bf6c-de11-be94-00142212c4b1
155 lines
4.1 KiB
XML
155 lines
4.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 0b15fb2e4be999af651dcbc118059c97ee5ed4c9 Maintainer: seros Status: ready -->
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<!-- Reviewed: no Maintainer: andresdzphp -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-key-exists">
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<refnamediv>
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<refname>array_key_exists</refname>
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<refpurpose>Verifica si el índice o clave dada existe en el array</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>bool</type><methodname>array_key_exists</methodname>
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<methodparam><type>mixed</type><parameter>key</parameter></methodparam>
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<methodparam><type>array</type><parameter>array</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_key_exists</function> devuelve &true; si la
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<parameter>key</parameter> dada existe en el array. La
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<parameter>key</parameter> puede ser cualquier valor posible
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para índice de un array.
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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>key</parameter></term>
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<listitem>
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<para>
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Valor para verificar.
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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>array</parameter></term>
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<listitem>
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<para>
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Un array con las claves para verificar
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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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&return.success;
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</para>
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<note>
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<para>
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<function>array_key_exists</function> buscará las claves en la primera dimensión solamente.
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Las claves anidadas en arrays multidimensionales no se encontrarán.
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</para>
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</note>
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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_key_exists</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$search_array = array('first' => 1, 'second' => 4);
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if (array_key_exists('first', $search_array)) {
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echo "The 'first' element is in the array";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<example>
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<title><function>array_key_exists</function> vs <function>isset</function></title>
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<para>
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<function>isset</function> no retorna &true; para claves de array
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que correspondan a un valor &null;, mientras que
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<function>array_key_exists</function> si lo hace.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$search_array = array('first' => null, 'second' => 4);
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// returns false
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isset($search_array['first']);
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// returns true
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array_key_exists('first', $search_array);
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?>
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]]>
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</programlisting>
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</example>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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<note>
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<para>
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Por razones de retrocompatilibidad, <function>array_key_exists</function>
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también devuelve &true; si <parameter>key</parameter> es una propiedad
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definida dentro de un <type>objeto</type> dado como
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<parameter>array</parameter>. No debería depender de este comportamiento,
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y se ha tener cuidado para asegurarse de que <parameter>array</parameter> es
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un <type>array</type>.
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</para>
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<para>
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Para comprobar si una propiedad existe en un objeto, use
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<function>property_exists</function>.
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</para>
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</note>
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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>isset</function></member>
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<member><function>array_keys</function></member>
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<member><function>in_array</function></member>
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<member><function>property_exists</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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