See if you have the underscore line between 'select' and 'multi'.
$modversion['config'][1]['formtype'] = 'select_multi';
$member_handler =& xoops_gethandler('member');
//Retrieve all users in our site
$members =& $member_handler->getUsers();
//Loop through each user and output desired fields:
foreach ($members as $obj) {
echo('Member Name: ' . $obj->getVar('name'));
echo('ID #: ' . $obj->getVar('uid'));
echo('Joined: ' . formatTimestamp($obj->getVar('user_regdate')));
echo('Last Login: ' . formatTimestamp($obj->getVar('last_login')));
echo('Is Online?: ' . $obj->isOnline());
}
Array ( [0] => 1 )