https://github.com/peachpiecompiler/peachpie/wiki/Peachpie-R...
Looks like PHP 5.4 and 7.1 roadmap goals have been achieved.
Though http://www.peachpie.io/about references Phalanger as the inspiration which apparently got as far as PHP 5.6.
There's also compatibility page that looks useful:
https://github.com/peachpiecompiler/peachpie/wiki/Compatibil...