/**
* This overrides the ArrayObject's own
* method so that if something is added
* to this object by using
* $Request['var'] = $val then it is
* automatically also added to aFiltered array
*
* @param $key
* @param $val
*/
public function offsetSet($key, $val)
{
parent::offsetSet($key, $val);
$this->aFiltered[$key] = $val;
}