error_reporting(E_ALL);
    var_dump(321);
    require_once sfConfig::get('app_fudforum_lib_path').'/scripts/fudapi.inc.php';
    var_dump(33);
    fud_add_user(array('login' => $this->getUsername(), 'passwd' => $this->getPassword(), 'email' => 'atualizar', 'name' => $this->getUsername()), array());

<?php
 require_once 'GLOBALS.php';
 require_once 'fudapi.inc.php';
 fud_add_user( array('login'=>'me', 'passwd'=>'pass', 'email'=>'me(at)nowhere(dot)com', 'name'=>'Me'), &$err);
?>

public function postInsert($event) {
 error_reporting(E_ALL);
 var_dump('INCLUDING GLOBALS');
 require_once sfConfig::get('app_fudforum_lib_path').'/scripts/GLOBALS.php';
 var_dump('INCLUDING API');
 require_once sfConfig::get('app_fudforum_lib_path').'/scripts/fudapi.inc.php';
 var_dump('CREATING USER');
 var_dump($this->getUsername());
 var_dump($this->getPassword());
 fud_add_user(array('login' => $this->getUsername(), 'passwd' => $this->getPassword(), 'email' => 'atualizar', 'name' => $this->getUsername()), array());    
 var_dump('DONE!!!');
}

string(17) "INCLUDING GLOBALS"
string(13) "INCLUDING API"

fud_use('db.inc');

include_once dirname(__FILE__) . fud_theme . $file;

protected function myAddUser()
{
    $Root = realpath($_SERVER["DOCUMENT_ROOT"]);
    include_once $Root.'/forum_data/include/GLOBALS.php';
    include_once $Root.'/forum_data/scripts/forum_login.php';
    __fud_login_common(1); // The main point!!
    include_once $Root.'/forum_data/scripts/fudapi.inc.php';

    //use function within fudapi
    fud_add_user($arg, &err);
    .....
}