code: public function max($key = false)
      {
          $collection = $this->getIterator();
          $max = 0;
          $valueToReturn = 0;
          foreach ($collection as $result) {
              if ($key && isset($result->$key)) {
                  if ($result->$key > $max) {
                      $max = $result->$key;
                      $valueToReturn = $result;
                  }
              }
              else if ($key && isset($result[$key])) {
                  if ($result[$key] > $max) {
                      $max = $result[$key];    
                      $valueToReturn = $result;
                  }
              }
              else {
                  if ($result > $max) {
                      $max = $result;
                      $valueToReturn = $result;
                  }
              }
          }
          return $valueToReturn;
      }
docs: Returns the largest value.
  
  @param key A key on which to sum the when looking at the contents of this Container.
  @return mixed Value