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ca0e422a27
instanceof operator. This deals with bug #27503 git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@159560 c90b9560-bf6c-de11-be94-00142212c4b1
93 lines
2.4 KiB
XML
93 lines
2.4 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.7 $ -->
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<!-- splitted from ./en/functions/classobj.xml, last change in rev 1.33 -->
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<refentry id="function.is-a">
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<refnamediv>
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<refname>is_a</refname>
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<refpurpose>
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Returns &true; if the object is of this class or has this class as
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one of its parents
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>bool</type><methodname>is_a</methodname>
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<methodparam><type>object</type><parameter>object</parameter></methodparam>
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<methodparam><type>string</type><parameter>class_name</parameter></methodparam>
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</methodsynopsis>
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<para>
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This function returns &true; if the object is of this class or
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has this class as one of its parents, &false; otherwise.
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</para>
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<para>
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<example>
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<title><function>is_a</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// define a class
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class WidgetFactory
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{
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var $oink = 'moo';
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}
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// create a new object
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$WF = new WidgetFactory();
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if (is_a($WF, 'WidgetFactory')) {
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echo "yes, \$WF is still a WidgetFactory\n";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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The <function>is_a</function> function is deprecated as of PHP 5 in
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favor of the <link linkend="language.operators.type">instanceof</link>
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type operator. In the above example we could use the following in
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PHP 5:
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</para>
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<para>
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<example>
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<title>Using the <emphasis>instanceof</emphasis> operator in PHP 5</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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if ($WF instanceof WidgetFactory) {
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echo 'Yes, $WF is a WidgetFactory';
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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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<simpara>
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See also <function>get_class</function>,
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<function>get_parent_class</function>, and
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<function>is_subclass_of</function>.
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</simpara>
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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:"../../../../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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