HM\BackUpWordPress\Site_Size::directory_filesize PHP Метод

    public function directory_filesize(\SplFileInfo $file)
    {
        // For performance reasons we cache the root.
        if ($file->getRealPath() === PATH::get_root() && $this->excludes) {
            $directory_sizes = get_transient('hmbkp_root_size');
            if ($directory_sizes) {
                return (int) $directory_sizes;
            }
        }
        // If we haven't calculated the site size yet then kick it off in a thread.
        $directory_sizes = $this->get_cached_filesizes();
        if (!is_array($directory_sizes)) {
            $this->rebuild_directory_filesizes();
            // Intentionally return null so the caller can tell that the size is being calculated.
            return null;
        }
        /*
         * Ensure we only include files in the current path, the filepaths are stored in keys
         * so we need to flip for use with preg_grep.
         */
        $directory_sizes = array_flip(preg_grep('(' . wp_normalize_path($file->getRealPath()) . ')', array_flip($directory_sizes)));
        if ($this->excludes) {
            $excludes = implode('|', $this->excludes->get_excludes_for_regex());
            if ($excludes) {
                // Use PREG_GREP_INVERT to remove any filepaths which match an exclude rule
                $directory_sizes = array_flip(preg_grep('(' . $excludes . ')', array_flip($directory_sizes), PREG_GREP_INVERT));
            }
        }
        $directory_sizes = absint(array_sum($directory_sizes));
        // For performance reasons we cache the root.
        if ($file->getRealPath() === PATH::get_root() && $this->excludes) {
            set_transient('hmbkp_root_size', $directory_sizes, DAY_IN_SECONDS);
        }
        // Directory size is now just a sum of all files across all sub directories.
        return (int) $directory_sizes;
    }