<?php
require_once "/home/lijunjie/vendor/autoload.php";

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\IOFactory;

class XLSX_Helper
{

    private $spreadsheet;

    function __construct()
    {
        $this->spreadsheet = new Spreadsheet();
    }

    function getSpreadsheet()
    {
        return $this->spreadsheet;
    }

    function output($filename = "output")
    {
        header('Content-Type: application/vnd.ms-excel');
        header('Content-Disposition: attachment;filename="' . $filename . '.xlsx');
        header('Cache-Control: max-age=0');
        header('Cache-Control: max-age=1');
        header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
        header('Cache-Control: cache, must-revalidate');
        header('Pragma: public');
        $writer = IOFactory::createWriter($this->spreadsheet, 'Xlsx');
        $writer->save('php://output');
    }
}