Wordpress Multi-network switch_to_blog

function switch_to_network_blog($network_prefix, $blog_id)
{
    global $wpdb, $wp_object_cache, $last_network_prefix;

    //save prefix for restoring
    $last_network_prefix = $wpdb->base_prefix;

    if($network_prefix == $last_network_prefix)
    {
        //if on the same network, use wp functionality
        switch_to_blog($blog_id);
    }
    else
    {
        //Change prefix
        $wpdb->base_prefix = $network_prefix;
        $wpdb->prefix = $wpdb->get_blog_prefix();

        //Switch over
        switch_to_blog($blog_id);

        //Clear cache
        $wp_object_cache->flush();
    }
}

function restore_current_network_blog()
{
    global $wpdb, $wp_object_cache, $last_network_prefix;

    if($last_network_prefix == $wpdb->base_prefix)
    {
        //if on the same network, use wp functionality
        restore_current_blog();
    }
    else
    {
        //Change prefix
        $wpdb->base_prefix = $last_network_prefix;
        $wpdb->prefix = $wpdb->get_blog_prefix();

        //Restore
        restore_current_blog();

        //Clear cache
        $wp_object_cache->flush();
    }
}