Torrent::files PHP Method

    private function files($files, $piece_length)
    {
        sort($files);
        usort($files, create_function('$a,$b', 'return strrpos($a,DIRECTORY_SEPARATOR)-strrpos($b,DIRECTORY_SEPARATOR);'));
        $first = current($files);
        if (!self::is_url($first)) {
            $files = array_map('realpath', $files);
        } else {
            $this->url_list(dirname($first) . DIRECTORY_SEPARATOR);
        }
        $files_path = array_map('self::path_explode', $files);
        $root = call_user_func_array('array_intersect_assoc', $files_path);
        $pieces = null;
        $info_files = array();
        $count = count($files) - 1;
        foreach ($files as $i => $file) {
            if (!($handle = self::fopen($file, $filesize = self::filesize($file)))) {
                self::set_error(new Exception('Failed to open file: "' . $file . '" discarded'));
                continue;
            }
            $pieces .= $this->pieces($handle, $piece_length, $count == $i);
            $info_files[] = array('length' => $filesize, 'path' => array_diff_assoc($files_path[$i], $root));
        }
        return array('files' => $info_files, 'name' => end($root), 'piece length' => $piece_length, 'pieces' => $pieces);
    }