laravel php spreadsheet 1

<?php
/*
        https://phpspreadsheet.readthedocs.io/en/latest/#hello-world
*/
        // require 'vendor/autoload.php';
        // -> tidak perlu karena automatis dari laravel

        // use PhpOffice\PhpSpreadsheet\Spreadsheet;
        // use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
        // langsung dijalankan di coding bawah

        // $spreadsheet = new Spreadsheet();
        $spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();


        $sheet = $spreadsheet->getActiveSheet();
        $sheet->setCellValue('A1', 'Hello World ! This is Laravel Excel');

        // $writer = new Xlsx($spreadsheet);
        $writer = new \PhpOffice\PhpSpreadsheet\Writer\Xlsx($spreadsheet);

        $writer->save('hello.xlsx');
        //menulis

        //dikeluarkan
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        header('Content-Disposition: attachment;filename="01simple.xlsx"');
        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
        $file = file_get_contents('hello.xlsx');
        print $file;