Matters

RAP - Rdf API for PHP V0.9 - Home: "RAP is a software package for parsing, searching, manipulating, serializing and serving RDF models.

Its features include:
statement-centric methods for manipulating an RDF model as a set of RDF triples
resource-centric methods for manipulating an RDF model as a set of resources
ontology-centric methods for manipulating an RDF model through vocabulary specific methods
integrated RDF/XML, N3 and N-TRIPLE parser
integrated RDF/XML, N3 and N-TRIPLE serializer
in-memory or database model storage
support for the RDQL query language
inference engine supporting RDF-Schema reasoning and some OWL entailments
integrated RDF server providing similar functionality as the Joseki RDF server
graphical user-interface for managing database-backed RDF models
support for common vocabularies "