mirror of
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2b5d30977d
git-svn-id: https://svn.php.net/repository/phpdoc/es/trunk@334651 c90b9560-bf6c-de11-be94-00142212c4b1
149 lines
3.7 KiB
XML
149 lines
3.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: e41aab5ecacf449e51179886c17f1d41735b0234 Maintainer: lboshell Status: ready -->
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<!-- Reviewed: no -->
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<refentry xml:id="function.class-exists" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>class_exists</refname>
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<refpurpose>Verifica si la clase ha sido definida</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>class_exists</methodname>
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<methodparam><type>string</type><parameter>class_name</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>autoload</parameter><initializer>true</initializer></methodparam>
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</methodsynopsis>
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<para>
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Esta función verifica si la clase dada ha sido definida o no.
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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>class_name</parameter></term>
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<listitem>
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<para>
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El nombre de la clase. El nombre es coincidido de manera insensible a mayúsculas y minúsculas.
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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>autoload</parameter></term>
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<listitem>
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<para>
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Indica si ha de llamarse &link.autoload; o no de forma predeterminada.
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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 &true; si <parameter>class_name</parameter> es una clase
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definida, &false; de lo contrario.
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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>5.0.2</entry>
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<entry>
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Ya no devuelve &true; para interfaces definidas. En ese caso se debe
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usar <function>interface_exists</function>.
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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>class_exists</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Verificar que la clase exista antes de usarla
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if (class_exists('MiClase')) {
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$mi_clase = new MiClase();
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}
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?>
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]]>
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</programlisting>
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</example>
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<example>
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<title>Ejemplo del parámetro <parameter>autoload</parameter></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function __autoload($clase)
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{
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include($clase . '.php');
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// Verificar si la sentencia include declaró la clase
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if (!class_exists($clase, false)) {
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trigger_error("No es posible cargar la clase: $clase", E_USER_WARNING);
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}
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}
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if (class_exists('MiClase')) {
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$mi_clase = new MiClase();
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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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</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>function_exists</function></member>
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<member><function>interface_exists</function></member>
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<member><function>get_declared_classes</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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