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

8726function get_dirsize( $directory, $max_execution_time = null ) {8727 8728	/*8729	 * Exclude individual site directories from the total when checking the main site of a network,8730	 * as they are subdirectories and should not be counted.8731	 */8732	if ( is_multisite() && is_main_site() ) {8733		$size = recurse_dirsize( $directory, $directory . '/sites', $max_execution_time );8734	} else {8735		$size = recurse_dirsize( $directory, null, $max_execution_time );8736	}8737 8738	return $size;8739}