Visualizzare nella directory soltanto cartelle?

[gianiaz]

    $d = dir("../DOC/RassegnaStampa/");
    $n = 0;
    while ($entry = $d->read()) {
        if(is_dir($entry) {
    	  $nProgr = $n++;
    	  echo "<input type='checkbox' name=" . $entry . " value=" . $nProgr  .">" . $entry. "
\n";
        }
    }
    $d->close();