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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<refentry xml:id="function.is-subclass-of" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>is_subclass_of</refname>
<refpurpose>Checks if the object has this class as one of its parents</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>is_subclass_of</methodname>
<methodparam><type>mixed</type><parameter>object</parameter></methodparam>
<methodparam><type>string</type><parameter>class_name</parameter></methodparam>
</methodsynopsis>
<para>
Checks if the given <parameter>object</parameter> has the class
<parameter>class_name</parameter> as one of its parents.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>object</parameter></term>
<listitem>
<para>
A class name or an object instance
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>class_name</parameter></term>
<listitem>
<para>
The class name
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
This function returns &true; if the object <parameter>object</parameter>,
belongs to a class which is a subclass of
<parameter>class_name</parameter>, &false; otherwise.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.0.3</entry>
<entry>
You may also specify the <parameter>object</parameter> parameter as a
string (the name of the class)
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>is_subclass_of</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// define a class
class WidgetFactory
{
var $oink = 'moo';
}
// define a child class
class WidgetFactory_Child extends WidgetFactory
{
var $oink = 'oink';
}
// create a new object
$WF = new WidgetFactory();
$WFC = new WidgetFactory_Child();
if (is_subclass_of($WFC, 'WidgetFactory')) {
echo "yes, \$WFC is a subclass of WidgetFactory\n";
} else {
echo "no, \$WFC is not a subclass of WidgetFactory\n";
}
if (is_subclass_of($WF, 'WidgetFactory')) {
echo "yes, \$WF is a subclass of WidgetFactory\n";
} else {
echo "no, \$WF is not a subclass of WidgetFactory\n";
}
// usable only since PHP 5.0.3
if (is_subclass_of('WidgetFactory_Child', 'WidgetFactory')) {
echo "yes, WidgetFactory_Child is a subclass of WidgetFactory\n";
} else {
echo "no, WidgetFactory_Child is not a subclass of WidgetFactory\n";
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
yes, $WFC is a subclass of WidgetFactory
no, $WF is not a subclass of WidgetFactory
yes, WidgetFactory_Child is a subclass of WidgetFactory
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>get_class</function></member>
<member><function>get_parent_class</function></member>
<member><function>is_a</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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