zlacker

Php 7 -> Php 8 is where php has really started making more breaking changes (for better or worse). Or at least introduced lots of new warnings.

>>bawolf+(OP)
Deprecation warnings for the most. But those can be taken away so you can have PHP 5/7/8 code without much deviation.

More than a LTS release I'd prefer more PHP 8 releases than the five in 7.x, e.g. more until 8.8 or 8.9.