PHPExcel 导出大数据时开启缓存机制

function ExportExcel()
{
 // 导出程序
    $phpexlce_location = Kohana::find_file('classes', 'Vendor/PHPExcel/PHPExcel');
        require_once $phpexlce_location;

//此处是重点，设置超时的时间是300S，设置ini的内存限制有1G
        set_time_limit(300);
        ini_set("memory_limit","1024M");

        $cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_in_memory_gzip;    // 设置缓存的内存格式
        $cacheSettings = array();  // 缓存的数据格式为数组
        PHPExcel_Settings::setCacheStorageMethod($cacheMethod,$cacheSettings);  // 设置生效

        // Create new PHPExcel object
        $objPHPExcel = new PHPExcel();

 // Set document properties
        $objPHPExcel->getProperties()->setCreator("SomeOne")
            ->setLastModifiedBy("XXX")
            ->setTitle("Office 2007 XLSX Test Document")
            ->setSubject("Office 2007 XLSX Test Document")
            ->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.")
            ->setKeywords("office 2007 openxml php")
            ->setCategory("Test result file");

        // Add 表头
        $objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue('A1', 'SKU')
            ->setCellValue('B1', '产品名称')
            ->setCellValue('C1', '型号')
            ->setCellValue('D1', '规格')
            ->setCellValue('E1', '单位')
            ->setCellValue('F1', '实际库存')
            ->setCellValue('G1', '数量')
            ->setCellValue('H1', '单价')
            ->setCellValue('I1', '库存金额')
            ->setCellValue('J1', '批号')
            ->setCellValue('K1', '序列号')
            ->setCellValue('L1', '仓库')
            ->setCellValue('M1', '库位');

        $column_number = 1;
        foreach( $products as $v )
        {
            $column_number ++;
            $objPHPExcel->setActiveSheetIndex(0)
                ->setCellValue('A' . $column_number, $v->d_sku)
                ->setCellValue('B' . $column_number, $v->d_material_name)
                ->setCellValue('C' . $column_number, $v->d_model_name)
                ->setCellValue('D' . $column_number, $v->mrm->specification)
                ->setCellValue('E' . $column_number, $v->mrm->unit)
                ->setCellValue('F' . $column_number, $v->stock_num)
                ->setCellValue('G' . $column_number, $v->number)
                ->setCellValue('H' . $column_number, $v->univalence)
                ->setCellValueExplicit('I' . $column_number, number_format($v->univalence * $v->stock_num,2),PHPExcel_Cell_DataType::TYPE_STRING)
                ->setCellValueExplicit('J' . $column_number, $v->batch->batch_name,PHPExcel_Cell_DataType::TYPE_STRING)
                ->setCellValue('K' . $column_number, $v->serial_num)
                ->setCellValue('L' . $column_number, $v->warehouse->warehouse_name)
                ->setCellValue('M' . $column_number, $v->storage_location);
        }

        // Rename worksheet
        $objPHPExcel->getActiveSheet()->setTitle('Simple');

        // Set active sheet index to the first sheet, so Excel opens this as the first sheet
        $objPHPExcel->setActiveSheetIndex(0);

        // excel name
        $xls_name =  $id .'清单.xls';

        // Redirect output to a client’s web browser (Excel5)
        header('Content-Type: application/vnd.ms-excel');
        header('Content-Disposition: attachment;filename="' . $xls_name . '"');
        header('Cache-Control: max-age=0');
        // If you're serving to IE 9, then the following may be needed
        header('Cache-Control: max-age=1');

        // If you're serving to IE over SSL, then the following may be needed
        header ('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
        header ('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified
        header ('Cache-Control: cache, must-revalidate'); // HTTP/1.1
        header ('Pragma: public'); // HTTP/1.0

        $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
        $objWriter->save('php://output');
        exit;
}