php code

i have this bit of code i'm stuck on, perhaps some good soul out there can see what I'm doing wrong?

I have this directory, where X number of include files reside. This code, loads X number of include files and displays them randomly. The X variable is not defined in the code, but picked up from the directory itself. So the code is successfully loading the folder, however is not displaying them randomly.

Any thoughts? Seems so simple, but I feel at a loss.

<?php $filedir = "photographers"; //The file folder

$i=0;

$handle = opendir($filedir);

while (false !==($file = readdir($handle)))
{
if ($file != "." && $file != "..")
{
include("$filedir/$file");
++$i;
}
}

closedir($handle);
?>