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  <refentry id="function.interface-exists">
   <refnamediv>
    <refname>interface_exists</refname>
    <refpurpose>Checks if the interface has been defined</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <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></methodparam>
    </methodsynopsis>
    <para>
     This function returns &true; if the interface given by
     <parameter>interface_name</parameter> has been defined,
     &false; otherwise.
    </para>
    <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>
    <para>
     <function>interface_exists</function> will attempt to call &link.autoload; by
     default, if you don't want <function>interface_exists</function> to 
     call &link.autoload;, you can set the parameter <parameter>autoload</parameter>
     to &false;.
    </para>
    <simpara>
     See also <function>class_exists</function>.
    </simpara>
   </refsect1>
  </refentry>

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