public function sort()
    {
        if (!$this->_sorted) {
            ksort($this->_ids, SORT_NUMERIC);
            $this->_sorted = true;
        }
    }
public function sort()
    {
        if (!$this->_sorted) {
            ksort($this->_ids, SORT_NUMERIC);
            $this->_sorted = true;
        }
    }
public function sort ( ) { if ( ! $ this -> _sorted ) { ksort ( $ this -> _ids , SORT_NUMERIC ) ; $ this -> _sorted = true ; } }
Sort the map.
Sort the map .