dokuwiki-plugin-userhomepage/action.php

<?php
/**
 * Action Plugin Prototype
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Christopher Smith <chris@jalakai.co.uk>
 */
// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

/**
 * All DokuWiki plugins to interfere with the event system
 * need to inherit from this class
 */
class DokuWiki_Action_Plugin extends DokuWiki_Plugin {

    /**
     * Registers a callback function for a given event
     */
    public function register(Doku_Event_Handler $controller) {
        trigger_error('register() not implemented in '.get_class($this), E_USER_WARNING);
    }
}