code: public static function getRuntime($path = '/')
      {
          // 真实路径
          $path_runtime = realpath(RUNTIME_PATH);
          $path_list = realpath(RUNTIME_PATH . $path);
          
          // 判断越界
          if (strpos($path_list, $path_runtime) === false) {
              return [];
          }
          
          // 列出文件
          $list = FileManager::listDir($path_list);
          foreach ($list as &$vo) {
              $vo['file_str'] = self::fileDir($vo['file'], $path_runtime);
              $vo['file'] = str_replace([
                  $path_runtime,
                  '\\'
              ], [
                  '',
                  '/'
              ], realpath($vo['file']));
              $vo['size'] = Common::formatBytes($vo['size']);
          }
          
          return $list;
      }
docs: 缓存文件
  
  @param string $path
  @return array