WordPress create an multisite/network super user

wp-create-super-user.php

<?php
// ADD NEW ADMIN USER TO WORDPRESS
// ----------------------------------
// Put this file in your Wordpress root directory and run it from your browser.
// Delete it when you're done.

require_once 'wp-load.php';
require_once 'wp-includes/registration.php';

$user_id = 5;

$blogs = get_blog_list( 0, 'all' );

foreach ( $blogs as $blog ) {
    add_user_to_blog( $blog['blog_id'], $user_id, 'administrator' );
}

$admins = get_super_admins();

if ( ! in_array( $email, $admins ) ) {
    $admins[] = '[email protected]';

    update_site_option('site_admins', $admins);
}

function grant_super_admin( $user_id ) {
	global $super_admins;

	// If global super_admins override is defined, there is nothing to do here.
	if ( isset($super_admins) )
		return false;

	do_action( 'grant_super_admin', $user_id );

	// Directly fetch site_admins instead of using get_super_admins()
	$super_admins = get_site_option( 'site_admins', array( 'admin' ) );

	$user = new WP_User( $user_id );
	if ( ! in_array( $user->user_login, $super_admins ) ) {
		$super_admins[] = $user->user_login;
		update_site_option( 'site_admins' , $super_admins );
		do_action( 'granted_super_admin', $user_id );
		return true;
	}
	return false;
}

grant_super_admin($user_id);

//http://wordpress.org/support/topic/recover-super-admin-access-after-username-change?replies=13