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git-svn-id: https://svn.php.net/repository/phpdoc/it/trunk@352237 c90b9560-bf6c-de11-be94-00142212c4b1
124 lines
3.1 KiB
XML
124 lines
3.1 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!-- EN-Revision: 53bdffa6b9f8ce5ffdaf476c9d450f7cd0d1afa2 Maintainer: pastore Status: ready -->
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<!-- CREDITS: darvina -->
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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 se la classe è stata definita</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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Questa funzione verifica se la classe è stata definita o meno.
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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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Il nome della classe. Il nome è cercato in modo case-insensitive.
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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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Se chiamare o no &link.autoload; per default.
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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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Restituisce &true; se <parameter>class_name</parameter> è una classe definita,
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&false; in caso contrario.
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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>Esempio di <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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// Verifica che la classe esista prima di provare ad usarla
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if (class_exists('MyClass')) {
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$myclass = new MyClass();
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}
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?>
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]]>
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</programlisting>
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</example>
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<example>
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<title>Esempio del parametro <parameter>autoload</parameter></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function __autoload($class)
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{
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include($class . '.php');
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// Verifica per vedere se l'include ha dichiarato la classe
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if (!class_exists($class, false)) {
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trigger_error("Unable to load class: $class", E_USER_WARNING);
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}
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}
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if (class_exists('MyClass')) {
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$myclass = new MyClass();
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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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