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108 lines
2.6 KiB
XML
108 lines
2.6 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 96c9d88bad9a7d7d44bfb7f26c226df7ee9ddf26 Maintainer: jesusruiz Status: ready -->
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<refentry xml:id="function.is-null" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>is_null</refname>
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<refpurpose>
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Comprueba si una variable es &null;
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</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>is_null</methodname>
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<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
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</methodsynopsis>
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<para>
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Comprueba si la variable dada es &null;.
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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>var</parameter></term>
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<listitem>
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<para>
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La variable a ser evaluada
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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>var</parameter> es <type>null</type>, &false;
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de lo 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>Ejemplo <function>is_null</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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error_reporting(E_ALL);
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$foo = NULL;
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var_dump(is_null($inexistent), is_null($foo));
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?>
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]]>
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</programlisting>
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<screen>
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<![CDATA[
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Aviso: Variable indefinida: inexistente en ...
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bool(true)
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bool(true)
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]]>
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</screen>
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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>El tipo <link linkend="language.types.null.syntax">&null;</link></member>
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<member><function>isset</function></member>
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<member><function>is_bool</function></member>
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<member><function>is_numeric</function></member>
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<member><function>is_float</function></member>
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<member><function>is_int</function></member>
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<member><function>is_string</function></member>
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<member><function>is_object</function></member>
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<member><function>is_array</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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