ini_set('memory_limit','1024M');

$objectPHPExcel->getActiveSheet()->setCellValue('B' . ($n), $value->a);
$objectPHPExcel->getActiveSheet()->setCellValueExplicit('C' . ($n), $value->b);

ob_end_clean();

ob_start();
$objWriter= \PHPExcel_IOFactory::createWriter($objectPHPExcel, 'Excel5');
$objWriter->save(Yii::$app->basePath . '/web/123.xlsx');

//$objWriter= \PHPExcel_IOFactory::createWriter($objectPHPExcel, 'Excel5');

// $objWriter->save('php://output');

echo 'success';