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<refentry xml:id="function.interface-exists" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>interface_exists</refname>
  <refpurpose>Checks if the interface has been defined</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>interface_exists</methodname>
   <methodparam><type>string</type><parameter>interface_name</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>autoload</parameter><initializer>true</initializer></methodparam>
  </methodsynopsis>
  <para>
   Checks if the given interface has been defined.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>interface_name</parameter></term>
     <listitem>
      <para>
       The interface name
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>autoload</parameter></term>
     <listitem>
      <para>
       Whether to call &link.autoload; or not by default
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if the interface given by 
   <parameter>interface_name</parameter> has been defined, &false; otherwise.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>interface_exists</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
// Check the interface exists before trying to use it
if (interface_exists('MyInterface')) {
    class MyClass implements MyInterface
    {
        // Methods
    }
}

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>class_exists</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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