I've also written a little test script using the ARC Simple Model class which helped me identify issues with the parser and also generated the test results.
As far as I know, ARC is currently the only PHP-based parser that passes all of the 128 positive tests, but in case you need a validating parser, RAP is still the only choice. The only tests it doesn't pass correctly are those using a non-ASCII
rdf:ID, or XML literals. (Not passing the latter ones could also be my fault as RAP's N-Triples serializer is using a version of ARC's unicode NFC encoder. Shame on me then..)