mirror of
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e84dc0882b
git-svn-id: https://svn.php.net/repository/phpdoc/it/trunk@339829 c90b9560-bf6c-de11-be94-00142212c4b1
107 lines
2.7 KiB
XML
107 lines
2.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- EN-Revision: 96c9d88bad9a7d7d44bfb7f26c226df7ee9ddf26 Maintainer: reghe Status: ready -->
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<refentry xml:id="function.defined" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>defined</refname>
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<refpurpose>Verifica se dato nome di una costante, essa esiste</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>defined</methodname>
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<methodparam><type>string</type><parameter>name</parameter></methodparam>
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</methodsynopsis>
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<para>
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Verifica se la data costante esiste ed è definita.
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</para>
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<note>
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<para>
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Se vuoi verificare che una variabile esista, usa <function>isset</function>
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infatti <function>defined</function> si applica solo alle <link
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linkend="language.constants">costanti</link>. Se vuoi verificare che una
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funzione esista usa <function>function_exists</function>.
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</para>
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</note>
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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>name</parameter></term>
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<listitem>
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<para>
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Il nome della costante.
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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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Ritorna &true; se la costante con nome specificato da <parameter>name</parameter>
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è stata definita, &false; altrimenti.
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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>Controllo Costanti</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/* Notare l'uso degli apici. Questo esempio controlla se la stringa
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* 'TEST' è il nome di una costante esistente TEST */
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if (defined('TEST')) {
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echo TEST;
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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>define</function></member>
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<member><function>constant</function></member>
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<member><function>get_defined_constants</function></member>
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<member><function>function_exists</function></member>
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<member>La sezione sulle <link linkend="language.constants">Costanti</link></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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