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

8901function get_dirsize( $directory, $max_execution_time = null ) {8902 8903	/*8904	 * Exclude individual site directories from the total when checking the main site of a network,8905	 * as they are subdirectories and should not be counted.8906	 */8907	if ( is_multisite() && is_main_site() ) {8908		$size = recurse_dirsize( $directory, $directory . '/sites', $max_execution_time );8909	} else {8910		$size = recurse_dirsize( $directory, null, $max_execution_time );8911	}8912 8913	return $size;8914}