PHP - Printing a random file from a folder

This is one of the easiest ways to ad management out there. It selects a random file from the directory you chose and displays them randomly.
This code is useful if you have ad codes in different files and want to randomly rotate them.

$rmdlist=''; //$rmd_folder is the variable that choses the directory that the files will be in. Mine is images/rmd-img/ // Make sure you DO NOT forget about the "/" at the end or this will not work. $rmd_folder = "images/rmd-img/"; mt_srand((double)microtime()*1000); //use the directory class $imgs = dir($rmd_folder); //reads all the files from the directory you chose and ads them to a list. while ($file = $imgs->read()) { if (eregi("gif", $file) || eregi("jpg", $file) || eregi("png", $file)) $rmdlist .= "$file "; } closedir($imgs->handle); //now, put all the images into a array $rmdlist = explode(" ", $rmdlist); $no = sizeof($rmdlist)-2; //now, generate a randon number from 0 - the number of images in the directory you chose. $random = mt_rand(0, $no); $image = $rmdlist[$random]; //display's the image. echo ''; ?>