I’ve been developing a large & complex WP site (60+ CPTs using Pods & BP) for the past few months on PHP 7.1. I ran all PHP 7.1 RCs and so far the only issues I’ve seen are related to BP. I’m now at the point where I’ve had to disable BP to continue development on PHP 7.1 (I need nullable types and void returns from PHP 7.1) and ignore any BP features I have on my roadmap until it’s stable (I hope soon 🙂 )
I can’t report any issues with WP-core and PHP 7.1 that I’ve witnessed.
No trying to say that BP is crappy 🙂 – just a hint that the issue may be more likely to be on BP side (especially since it seems that BBPress had a similar issue which they’ve already fixed – see my link in previous post).
I see that BP 2.7.3 is due the day before PHP 7.1 GA. Perhaps a fix can be included in this release so there’s no lag between PHP 7.1 GA and BP working on PHP 7.1 – otherwise I assume we’ll be waiting for BP 2.7.4?