phpspreadsheet in Codeigniter4

Hi folks,

I am new in codeigniter 4, when needed to manipulate some excel files in my app I found the phpspreadsheet library convenient for that. However, after installing it using  composer I found it difficult to implement it in my app. 


Even when I tested their example hereafter couldn't work instead displayed 

<?php

require 'vendor/autoload.php';

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Hello World !');
$writer = new Xlsx($spreadsheet);
$writer->save('hello world.xlsx');

require(vendor/autoload.php): failed to open stream: No such file or directory 


I need a help on how to set it up and use it in my app.

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