WPDKUser::set_role PHP Method

    public function set_role($role)
    {
        // Before remove all previous
        $this->remove_all_caps();
        parent::set_role($role);
        // Flush user cache
        wp_cache_delete($this->ID, 'users');
        // Destroy the global
        global $current_user;
        unset($current_user);
        unset($GLOBALS['current_user']);
        // Reset as current
        wp_set_current_user($this->ID);
    }