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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.class-implements" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>class_implements</refname>
<refpurpose>
Return the interfaces which are implemented by the given class or interface
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>array</type><type>false</type></type><methodname>class_implements</methodname>
<methodparam><type class="union"><type>object</type><type>string</type></type><parameter>object_or_class</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>autoload</parameter><initializer>&true;</initializer></methodparam>
</methodsynopsis>
<para>
This function returns an array with the names of the interfaces that the
given <parameter>object_or_class</parameter> and its parents implement.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>object_or_class</parameter></term>
<listitem>
<para>
An object (class instance) or a string (class or interface name).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>autoload</parameter></term>
<listitem>
<para>
Whether to <link linkend="language.oop5.autoload">autoload</link>
if not already loaded.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
An array on success, or &false; when the given class doesn't exist.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>class_implements</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
interface foo { }
class bar implements foo {}
print_r(class_implements(new bar));
// you may also specify the parameter as a string
print_r(class_implements('bar'));
spl_autoload_register();
// use autoloading to load the 'not_loaded' class
print_r(class_implements('not_loaded', true));
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Array
(
[foo] => foo
)
Array
(
[foo] => foo
)
Array
(
[interface_of_not_loaded] => interface_of_not_loaded
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<simpara>
To check that an object implements an interface, &instanceof;
or the <function>is_a</function> function should be used instead.
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>class_parents</function></member>
<member><function>get_declared_interfaces</function></member>
<member><function>is_a</function></member>
<member>&instanceof;</member>
</simplelist>
</para>
</refsect1>
</refentry>
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