gistfile1.txt

      function checkbox_list ($data, $name = 'list', $parent = 0, &$label = null) {
        if (!empty($data)) {
          echo '<div class="categories sub">';
          foreach ($data as $item) {
            if (isset($item['children']) && !empty($item['children'])){
              $label .= (isset($label)) ? ' ' . $item['name'].' &raquo;' : $item['name'].' &raquo;';
              checkbox_list($item['children'], $name, $item['id'],$label);
            }else{
              echo (isset($label)) ? '<h3>'.$label.'</h3>' : false;
              echo '<label for="'.$name.'_'.$item['id'].'"><input type="checkbox" name="'.$name.'[]" value="'.$item['id'].'" id="'.$name.'_'.$item['id'].'" />'.$item['name'].'</label>';
              unset($label);
            }
          }
          echo '</div>';
        }
      }
      checkbox_list($classifications);