mirror of
https://github.com/php/doc-es.git
synced 2026-03-26 08:22:08 +01:00
125 lines
3.3 KiB
XML
125 lines
3.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
|
|
<!-- $Revision$ -->
|
|
<!-- EN-Revision: 42bd1bfed391b287e55e47fed1b8f8d22a033ee0 Maintainer: PhilDaiguille Status: ready -->
|
|
<!-- Reviewed: yes Maintainer: pmartin -->
|
|
<refentry xml:id="function.class-exists" xmlns="http://docbook.org/ns/docbook">
|
|
<refnamediv>
|
|
<refname>class_exists</refname>
|
|
<refpurpose>Verifica si una clase ha sido definida</refpurpose>
|
|
</refnamediv>
|
|
<refsect1 role="description">
|
|
&reftitle.description;
|
|
<methodsynopsis>
|
|
<type>bool</type><methodname>class_exists</methodname>
|
|
<methodparam><type>string</type><parameter>class</parameter></methodparam>
|
|
<methodparam choice="opt"><type>bool</type><parameter>autoload</parameter><initializer>&true;</initializer></methodparam>
|
|
</methodsynopsis>
|
|
<para>
|
|
Esta función verifica si una clase dada ha sido definida.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 role="parameters">
|
|
&reftitle.parameters;
|
|
<para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>class</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
El nombre de la clase. Se busca de manera insensible a la casse.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>autoload</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Si se debe llamar a <link linkend="language.oop5.autoload">autoload</link> por omisión.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 role="returnvalues">
|
|
&reftitle.returnvalues;
|
|
<para>
|
|
Devuelve &true; si <parameter>class</parameter> es una clase definida,
|
|
&false; en caso contrario.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1 role="examples">
|
|
&reftitle.examples;
|
|
<para>
|
|
<example>
|
|
<title>Ejemplo con <function>class_exists</function></title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
// Verifica que la clase existe antes de usarla
|
|
if (class_exists('MyClass')) {
|
|
$myclass = new MyClass();
|
|
}
|
|
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
</example>
|
|
<example>
|
|
<title>Ejemplo con el argumento <parameter>autoload</parameter></title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
spl_autoload_register(function ($class_name) {
|
|
include $class_name . '.php'
|
|
|
|
// Verifica si el include ha declarado la clase
|
|
if (!class_exists($class_name, false)) {
|
|
throw new LogicException("Unable to load class: $class_name");
|
|
}
|
|
});
|
|
|
|
if (class_exists(MyClass::class)) {
|
|
$myclass = new MyClass();
|
|
}
|
|
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
</example>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 role="seealso">
|
|
&reftitle.seealso;
|
|
<para>
|
|
<simplelist>
|
|
<member><function>function_exists</function></member>
|
|
<member><function>enum_exists</function></member>
|
|
<member><function>interface_exists</function></member>
|
|
<member><function>get_declared_classes</function></member>
|
|
</simplelist>
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|