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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<!-- splitted from ./en/functions/classobj.xml, last change in rev 1.4 -->
<refentry id="function.is-subclass-of">
<refnamediv>
<refname>is_subclass_of</refname>
<refpurpose>
Returns &true; if the object has this class as one of its parents
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<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>
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>
<note>
<para>
Since PHP 5.0.3 you may also specify the <parameter>object</parameter>
parameter as a string (the name of the class).
</para>
</note>
<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>
<simpara>
See also <function>get_class</function>,
<function>get_parent_class</function> and
<function>is_a</function>.
</simpara>
</refsect1>
</refentry>
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