It works fine with Varnish 4, open source version. Varnish Plus is not required.
Requerimientos
Para utilizar esta extensión, es necesario tener instalada la versión >=3.0 de Varnish Cache, disponible en la » página principal Varnish Cache
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User Contributed Notes 3 notes
info at getpagespeed dot com ¶
5 years ago
redactedprofile at gmail dot com ¶
9 years ago
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 :\
