How move user to other group witch custom profile set

[mokujin]

This is my plugin I use for my forum, hook register_addmember_process

PHP Code:

// userfield[field5]

if ($vbulletin->GPC['userfield']['fieldX'] == 'Y')
{
    unset($newusergroupid);
    $newusergroupid = 9;
    $userdata->set('usergroupid', $newusergroupid);

    // set user title
    $userdata->set_usertitle('', false, $vbulletin->usergroupcache["$newusergroupid"], false, false);
}