Nested WordPress Networks Using WP Multi Network

.htaccess

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)+?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)+?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)+?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
</IfModule>

# END WordPress

sunrise.php

<?php
if ( ! defined( 'SUNRISE_LOADED' ) )
    define( 'SUNRISE_LOADED', 1 );
    
if ( ! defined( 'COOKIE_DOMAIN' ) ) {
	define('COOKIE_DOMAIN', $_SERVER[ 'HTTP_HOST' ] );
} else {
    die("Error COOKIE DOMAIN");
}

$sites = $wpdb->get_results("SELECT * FROM {$wpdb->site} ORDER BY CHAR_LENGTH(path) DESC");
foreach ( $sites as $site ) {
    if ( false !== strpos( $_SERVER[ 'HTTP_HOST' ] . $_SERVER[ 'REQUEST_URI' ] . '/', $site->domain . $site->path ) ) {
        $site_id = $site->id;
        $current_site = $site;
        $wpdb->siteid = $site->id;
        break;
    }
}

$blogs = $wpdb->get_results("SELECT * FROM {$wpdb->blogs} WHERE site_id = {$site_id} ORDER BY CHAR_LENGTH(path) DESC");
foreach ( $blogs as $blog ) {
    if ( false !== strpos( str_replace( $site->domain, '', $_SERVER[ 'HTTP_HOST' ] . $_SERVER[ 'REQUEST_URI' ] . '/' ), $blog->path) ) {
        $blog_id = $blog->blog_id;
        $current_blog = $blog;
        $wpdb->blogid = $blod->id;
        break;
    }
}