I think you are misunderstanding something here. The PHP script is running on the server. It has no access to your local files.
The most common way to solve this is to do a file upload from your local machine through a HTML page. For that, see the PHP manual on file uploads.
Alternatively, if your machine and the server are in the same local network, you may be able to access your client PC's files through a network share. But we don't know enough about your setup to tell.
Pekka
2010-09-06 18:04:58