PHPspreadsheet show blank in browser tab - php

Question

I have used https://github.com/PHPOffice/phpspreadsheet this package to download
csv files in codeigniter
When I try to download it shows blank in browser tab and not showing download option
there are no errors
Tried with below code
<?php
if (!defined('BASEPATH')) exit('No direct script access allowed');
require 'vendor/autoload.php';
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
class Reports extends Admin_Controller
{
public function download()
{
$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Hello World !');
$writer = new Xlsx($spreadsheet);
$writer->save('hello world.xlsx');
}
}
Can any anyone help on that please??.Thanks

Answer 1

Hope this will help you :
require 'vendor/autoload.php';
use PhpOffice\PhpSpreadsheet\IOFactory;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
class Reports extends Admin_Controller
{
public function index()
{
$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Hello World !');
$spreadsheet->setActiveSheetIndex(0);
$filename = 'hello world';
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment;filename="'.$filename.'.xlsx"');
header('Cache-Control: max-age=0');
$writer = IOFactory::createWriter($spreadsheet, 'Xlsx');
$writer->save('php://output');
}
}
for csv just change the extesion .xlsx to .csv (case-sensitive)

Answer 2

The download() function you have there is only for writing a new file. Not anything to do with downloading a file. However I managed to output a file using this code here. I outputted a csv file so I could check it more easily on my server but the premise is still the same with xlsx files.
public function writeFile() {
$this->load->library('Spreadsheet');
$output_file = getcwd() . "/test/hello_world.csv";
$spreadsheet = new Spreadsheet();
$spreadsheet->setActiveSheetIndex(0);
$spreadsheet->getActiveSheet()->setCellValueByColumnAndRow("1", "1", "Hello World!");
$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Csv');
$writer->save($output_file);
}
I think part of your problem was not loading the library correctly using the CodeIgniter nomenclature. If you are trying to upload files I would reccomend using the upload library which comes with CodeIgniter. The documentation can be found here: https://www.codeigniter.com/userguide3/libraries/file_uploading.html
I would then use phpspreadsheet to edit it to your hearts content once it has been uploaded. Hope this helps.