...Although I'm more of a hacker than a PHP developer, I first upgraded on-best-effort-basis to b2evolution for PHP 8.0 &, gradually, to PHP 8.1 -- this current upload. I have added WebP image format support along the way.
I currently run this software on Apache & Nginx web servers. Sure, there are unresolved glitches but I expect that whoever uses this software will contribute to improving the software code base as ultimately you -- the user of this software -- will benefit from its improvements.
I've bundled several themes that have benefited from code upgrading that you can use; however, I encourage you to create & contribute your own themes and/or -- why not -- charge a subscription to continue improving your creative work. ...