/**
  * Validate an array
  *
  * @param	array	Array to be validated
  * @return	bool	True when the array is valid
  */
 public function validate($arr)
 {
     if (!is_array($arr)) {
         return false;
     }
     foreach ($arr as $var) {
         if (false === $this->_filter->validate($var)) {
             return false;
         }
     }
     return true;
 }