Little php based recursion function for putting together a list of folders in html.

helper.php

<?php
/*
** recursive function which builds child / parent option list of 
** select list options 
*/
     public function getSubfoldersList($parent_id)
     {
          $model = new BoxsearchModelBoxsearch();
          $subfolders = $model->getSubFolders($parent_id);
          $opts = '';
          foreach($subfolders as $folder) {
               $opts = '<option value="' . $folder->id . '"> . "-" ' . $folder->name . '</option>';
               if ($model->getSubFolders($folder->id)) {
                    $opts .= getSubfoldersList($folder->id);
               }
          }
          
          return $opts;
     }