It works fine with Varnish 4, open source version. Varnish Plus is not required.
Для работы модуля требуется установка библиотеки Varnish Cache 3.0 или новее. Ссылка для скачивания ускорителя Varnish Cache доступна » на главной странице проекта.
It works fine with Varnish 4, open source version. Varnish Plus is not required.Thank you Adrian Hernandez http://php.net/manual/en/varnish.requirements.php#115883
Yes this manual should be updated to make note of this.
may I ask simply why this requires Plus? I just lost hours implementing this only to see the extension refuses to load on my prod server :\