Mine

<?php
    $path = "/home/user/files/";
    $dir_handle = @opendir($path) or die("<option>Unable to open $path</option>"); 

    while ($file = readdir($dir_handle))
    {
        if($file!="." && $file!="..")
        print("<option value=$file>$file</option>");
    }
    closedir($dir_handle);
?>