how to make files downloadable from databas?

[A yos!]

hi all.
I'm new to programming arena. my prof. has given me a simple assignment of creating a database of existing movies in my hdd. i've created database, parsed into php, built a search query. next step is to make them downloadable.
m using WAMP server to do all these.
i've to click on a movie file and make it as a downloadable using php.. what's the script used to do these functions?? could any one plz assist me ?!

Thank you.

[ander]

You could use

<?php
readfile('C:\example\my-movie.avi');
?>