I'd like to have my PHP script upload a file with a certain filename in a directory of my choosing. However, the catch is that I need it to exist there immediately upon upload so I can moniter it on my server. I don't want to use a PHP extension or something - this should be very easy to transfer to any PHP setup.

So basically: Is there a way to guarantee that, from the very beginning of the file upload process, the file has a certain name and location on the server?