php-doc-en/reference/classobj/functions/is-a.xml

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 <refentry id="function.is-a">
   <refnamediv>
    <refname>is_a</refname>
    <refpurpose>
     Returns &true; if the object is of this class or has this class as 
     one of its parents
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>is_a</methodname>
      <methodparam><type>object</type><parameter>object</parameter></methodparam>
      <methodparam><type>string</type><parameter>class_name</parameter></methodparam>
     </methodsynopsis>
    <para>
     This function returns &true; if the object is of this class or 
     has this class as one of its parents, &false; otherwise.
    </para>
    <para>
      <example>
        <title><function>is_a</function> example</title>
        <programlisting role="php">
<![CDATA[
<?php
// define a class
class WidgetFactory
{
  var $oink = 'moo';
}

// create a new object
$WF = new WidgetFactory();

if (is_a($WF, 'WidgetFactory')) {
  echo "yes, $WF is still a WidgetFactory\n";
}
?>
]]>
        </programlisting>
      </example>
    </para>
    <simpara>
     See also <function>get_class</function>, 
     <function>get_parent_class</function>, and 
     <function>is_subclass_of</function>.
    </simpara>
   </refsect1>
  </refentry>

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