How to specify image folder path for each user when use TinyMce ImageManager with Symfony

First, in sfWidgetFormTextareaTinyMce class we set:

protected function configure($options = array(), $attributes = array())
  {
    ......
    $this->addOption('imagemanager_rootpath', 'mydir');
    ......
  }

public function render($name, $value = null, $attributes = array(), $errors = array())
  {
    $textarea = sfWidgetFormTextarea::render($name, $value, $attributes, $errors);

    $js = sprintf(<<<EOF
<script type="text/javascript">
  tinyMCE.init({
    mode: "exact",
    elements : '%1\$s',
    imagemanager_rootpath: '{0}/%2\$s',
    .....
  }

Second, i set a 'imagemanager_rootpath' value in action, to throw the value to form:

public function executeCreate(sfWebRequest $request)
  {
    ...
    $this->form = new TextForm(null, array('imagemanager_rootpath' => $user_id));
    ...
  }

Last, in the TextForm class, we configure the path:

public function configure()
  {
    .... 
    
    $path = $this->options['imagemanager_rootpath'];
    
    $user_dir = $_SERVER['DOCUMENT_ROOT'].'/uploads/submission/text/'.$path;
    if (!is_dir($user_dir)) mkdir($user_dir, 0777);
    
    $this->widgetSchema['content'] = new sfWidgetFormTextareaTinyMCE(array('width' => 480, 'height' => 250, 'imagemanager_rootpath' => $path));
    ....
}
    

more detail: http://www.tinymce.com/wiki.php/MCImageManager:rootpath