public function group($keys, array $initial, $reduce, array $options = array())
    {
        return $this->getCollection()->group($keys, $initial, $reduce, $options);
    }
public function group($keys, array $initial, $reduce, array $options = array())
    {
        return $this->getCollection()->group($keys, $initial, $reduce, $options);
    }
public function group ( $ keys , array $ initial , $ reduce , array $ options = array ( ) ) { return $ this -> getCollection ( ) -> group ( $ keys , $ initial , $ reduce , $ options ) ; }
Shortcut to the collection group method.

@param mixed $keys    The keys.
@param array $initial The initial value.
@param mixed $reduce  The reduce function.
@param array $options The options (optional).

@return array The result

@see \MongoCollection::group()

@api
Shortcut to the collection group method .