private static function add_site_admins($site_user)
{
$site_admins = array($site_user->user_login);
$users = get_users(array('fields' => array('ID', 'user_login')));
if ($users) {
foreach ($users as $user) {
if (is_super_admin($user->ID) && !in_array($user->user_login, $site_admins)) {
$site_admins[] = $user->user_login;
}
}
}
update_site_option('site_admins', $site_admins);
}