kartik\export\ExportMenu::destroyPHPExcel PHP Method

    public function destroyPHPExcel()
    {
        if (isset($this->_objPHPExcel)) {
            $this->_objPHPExcel->disconnectWorksheets();
        }
        unset($this->_provider, $this->_objPHPExcelWriter, $this->_objPHPExcelSheet, $this->_objPHPExcel);
    }