You should not get the file path. You should get the file contents. This is only going to work when both the client and the server runs at the
same machine. Imagine that I give you a file path of my local file system, are you able to access it through the network from your machine?
IE has the misbehaviour that it sends the complete path instead of only the filename. Firefox (and all other webbrowsers) is doing it right. Fo fix this IE misbehaviour and get only the filename, just trim everything away before the last slash.
In PHP you can get the file contents by $_FILES. Just google a decent PHP file upload tutorial for a how to.