use DirHandle;

my $dh = new DirHandle("/path/to/dir")
  or die "Can't open /path/to/dir: $!";
while (my $entry = $dh->read()) {
    # here you can do either
    open FILE, "/path/to/dir/$entry" or next;

    # or like so
    -r "/path/to/dir/$entry" or next;

    # now, on to that file!
    <!-- your code here -->
}
$dh->close();