public function getExport()
  {
      if (null === $this->export) {
          $this->export = array();
          $this->fillExport();
      }

      return $this->export;
  }
public function getExport()
  {
      if (null === $this->export) {
          $this->export = array();
          $this->fillExport();
      }

      return $this->export;
  }
public function getExport ( ) { if ( null === $ this -> export ) { $ this -> export = array ( ) ; $ this -> fillExport ( ) ; } return $ this -> export ; }
Return a list of columns from excel.export

@return array
Return a list of columns from excel . export