code: public function clearCacheFiles()
      {
          @trigger_error(sprintf('The %s method is deprecated since version 1.22 and will be removed in Twig 2.0.', __METHOD__), E_USER_DEPRECATED);
  
          if (is_string($this->originalCache)) {
              foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($this->originalCache), RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
                  if ($file->isFile()) {
                      @unlink($file->getPathname());
                  }
              }
          }
      }
docs: Clears the template cache files on the filesystem.
  
  @deprecated since 1.22 (to be removed in 2.0)