Using PHP to send file through a http pipe?

I was wondering if I could get some help on a minor problem I have. Here's the deal I have set up on my system. http://ftp.brajah.com/ I created this simple little interface to list files and directories in the public ftp folder. The only problem is, I had to move the whole directory to my web site just to allow people to download the file. (ie: (site)/ftp/atcommand.txt ) What I want to do is have a file (like get.php) which will read the file on the drive, and then transfer it through to the client on the browser. (ie: get.php?file=/atcommand.txt ) Is there a simple way to do this while reducing security concerns? (Ie: reading ../../../../../etc/passwd ) --Jack