get_dirsize( string $directory, int $max_execution_time = null ): int|false|null

8643function get_dirsize( $directory, $max_execution_time = null ) {8644 8645	/*8646	 * Exclude individual site directories from the total when checking the main site of a network,8647	 * as they are subdirectories and should not be counted.8648	 */8649	if ( is_multisite() && is_main_site() ) {8650		$size = recurse_dirsize( $directory, $directory . '/sites', $max_execution_time );8651	} else {8652		$size = recurse_dirsize( $directory, null, $max_execution_time );8653	}8654 8655	return $size;8656}