wp_update_site

 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int   $site_id ID of the site that should be updated.
 * @param array $data    Site data to update. See {@see wp_insert_site()} for the list of supported keys.
 * @return int|WP_Error The updated site's ID on success, or error object on failure.
 */
function wp_update_site( $site_id, array $data ) {
	global $wpdb;

	if ( empty( $site_id ) ) {
		return new WP_Error( 'site_empty_id', __( 'Site ID must not be empty.' ) );
	}

	$old_site = get_site( $site_id );
	if ( ! $old_site ) {
		return new WP_Error( 'site_not_exist', __( 'Site does not exist.' ) );
	}

	$defaults                 = $old_site->to_array();
	$defaults['network_id']   = (int) $defaults['site_id'];
	$defaults['last_updated'] = current_time( 'mysql', true );
	unset( $defaults['blog_id'], $defaults['site_id'] );

	$data = wp_prepare_site_data( $data, $defaults, $old_site );
	if ( is_wp_error( $data ) ) {
		return $data;
	}

	if ( false === $wpdb->update( $wpdb->blogs, $data, array( 'blog_id' => $old_site->id ) ) ) {
		return new WP_Error( 'db_update_error', __( 'Could not update site in the database.' ), $wpdb->last_error );
	}

	clean_blog_cache( $old_site );

	$new_site = get_site( $old_site->id );

	/**
	 * Fires once a site has been updated in the database.
	 *
	 * @since 5.1.0
	 *