treemenu with select-dropdown-output

menu.select.php

<select><?php snippet('treemenu') ?></select>

treemenu.php

<?php if(!isset($subpages)) $subpages = $site->pages() ?>
  <?php foreach($subpages->visible() as $p): ?>
  <option value="<?php echo $p->url() ?>"><?php echo $p->title() ?></option>
  <?php if($p->hasChildren()): ?>
    <?php snippet('treemenu', array('subpages' => $p->children())) ?>
  <?php endif ?>
  <?php endforeach ?>