public function sortKeys()
    {
        if ($this->isNotEmpty()) {
            foreach ($this->rows as &$row) {
                ksort($row);
            }
        }
        return $this;
    }
public function sortKeys()
    {
        if ($this->isNotEmpty()) {
            foreach ($this->rows as &$row) {
                ksort($row);
            }
        }
        return $this;
    }
public function sortKeys ( ) { if ( $ this -> isNotEmpty ( ) ) { foreach ( $ this -> rows as & $ row ) { ksort ( $ row ) ; } } return $ this ; }
Sort asc data rows by column name

@return DataStore This datastore after sorted.
Sort asc data rows by column name