public final function get($key)
    {
        if (isset($this->_map[$key])) {

            return $this->_map[$key];
        }

        return null;
    }
public final function get($key)
    {
        if (isset($this->_map[$key])) {

            return $this->_map[$key];
        }

        return null;
    }
public final function get ( $ key ) { if ( isset ( $ this -> _map [ $ key ] ) ) { return $ this -> _map [ $ key ] ; } return null ; }
Returns the value to which this map maps the specified key.

Returns null if the map contains no mapping for this key. A return value of null
does not necessarily indicate that the map contains no mapping for the key; it's
also possible that the map explicitly maps the key to null. The containsKey
operation may be used to distinguish these two cases.

@param string $key Key whose associated value is to be returned.

@return mixed The value to which this map maps the specified key, or null if the
map contains no mapping for this key.
Returns the value to which this map maps the specified key .