Extracts multiple files in the archive to the specified path.
string $path: A full system path of the directory to which to extract files.
array $files: Optionally specify a list of files to be extracted. Files are relative to the root of the archive. If not specified, all files in the archive will be extracted.
Drupal\Component\Archiver\ArchiverInterface The called object.
public function extract($path, array $files = array());