JSON_PRETTY_PRINT
JSON_PRETTY_PRINT

closes https://github.com/peachpiecompiler/peachpie/issues/392

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