I have a XML file and a a bunch of XSD files with schemas. How do I parse the XML file using the correct XSD file and schema in PHP?
You can use the DOM or XmlReader extensions
to validate documents against a schema.
Check this tool - http://github.com/moyarada/XSD-to-PHP. It sounds exactly what you're asking. You can marshal/unmarshal XML usind generated from XSD PHP classes.