I have noticed some edits in Chinese Wikipedia. It seems that an IP user can choose which PHP engine they use?
Topic on Talk:Beta Features/PHP7
It looks like the PHP_ENGINE
cookie, which the beta feature uses, is not deleted on logout, so if a user selects the PHP7 beta feature and then logs out, I think they’ll continue to use PHP7. Perhaps that is what happened here?
That said, there are also plans to enable PHP7 for some anonymous users as part of A/B testing (T216676), so I would expect this to happen more frequently soon.
@Lucas Werkmeister (WMDE): Some local sysops are wondering if these IPs are socket puppets, since enabling a beta feature manually is strange for an IP user. Anyway, thank you.
Bahaha, I had logged out on metawiki to test this and apparently I needed to reload this talk page after the re-login :D (filed T217774 for this)