ElggUser::makeAdmin PHP Method

    public function makeAdmin()
    {
        if ($this->isAdmin()) {
            return true;
        }
        // If already saved, use the standard function.
        if ($this->guid && !make_user_admin($this->guid)) {
            return false;
        }
        // need to manually set attributes since they've already been loaded.
        $this->attributes['admin'] = 'yes';
        return true;
    }