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

8778function get_dirsize( $directory, $max_execution_time = null ) {8779 8780	/*8781	 * Exclude individual site directories from the total when checking the main site of a network,8782	 * as they are subdirectories and should not be counted.8783	 */8784	if ( is_multisite() && is_main_site() ) {8785		$size = recurse_dirsize( $directory, $directory . '/sites', $max_execution_time );8786	} else {8787		$size = recurse_dirsize( $directory, null, $max_execution_time );8788	}8789 8790	return $size;8791}