Turn illegal string offset error to warning
Turn illegal string offset error to warning

Fix the currently failing tests and the compatibility with PHP.

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