PhpNumber +/- operators fix
PhpNumber +/- operators fix

peachpiecompiler/peachpie,iolevel/peachpie,iolevel/peachpie,iolevel/peachpie-concept,iolevel/peachpie-concept,peachpiecompiler/peachpie,iolevel/peachpie-concept,peachpiecompiler/peachpie,iolevel/peachpie