pages/user/index.php

<?php
 
switch ($op) {
   //
   // Misc.
   //
   case 'index':
   case 'setLocale':
   case 'authorizationDenied':
   case 'getInterests':
   case 'toggleHelp':
      define('HANDLER_CLASS', 'UserHandler');
      import('pages.user.UserHandler');
      break;
   default:
      require_once('lib/pkp/pages/user/index.php');
}