you can make xampp recognize more php version. just play around on your port. in http conf and xampp conf.
i.e launcher 90,9090,10008 (default 80,8080,10007)
parser port 92
it depend on which php version u using
im quite new in RF dev things. Forgive me i f my explaination very not clear
(note : php version running on my xampp htdocs 8,7 ( on development my own gm gamecp), 5(parser only).