php-doc-en/reference/spl/functions/class-implements.xml

<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.10 $ -->
<refentry id="function.class-implements">
 <refnamediv>
  <refname>class_implements</refname>
  <refpurpose>
   Return the interfaces which are implemented by the given class
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>class_implements</methodname>
   <methodparam><type>mixed</type><parameter>class</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>autoload</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function returns an array with the names of the interfaces that the
   given <parameter>class</parameter> and its parents implement.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>class</parameter></term>
     <listitem>
      <para>
       An object (class instance) or a string (class name).
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>autoload</parameter></term>
     <listitem>
      <para>
       Whether to allow this function to load the class automatically through
       the <link linkend="language.oop5.autoload">__autoload</link> magic
       method. Defaults to &true;.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>


 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an array or &false; on error.
  </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>5.1.0</entry>
       <entry>
        Added the option to pass the <parameter>class</parameter> parameter as
        a string. Added the <parameter>autoload</parameter> parameter.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </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));

// since PHP 5.1 you may also specify the parameter as a string
print_r(class_implements('bar'));


function __autoload($class_name) {
   require_once $class_name . '.php';
}

// use __autoload to load the 'not_loaded' class
print_r(class_implements('not_loaded', true));

?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Array
(
    [foo] => foo
)

Array
(
    [interface_of_not_loaded] => interface_of_not_loaded
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>class_parents</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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