How to properly install Phpspreadsheet in laravel 5.5

Objective

I'm trying to run the package PhpSpreadsheet on Laravel.

Problem

When I try to execute the hello example from the documentation, but I got this error:

main(): Failed opening required 'vendor/autoload.php' (include_path='C:\xampp\php\PEAR')

Steps

I've tried to follow the documentation then I did the following:

1. After running: composer require phpoffice/phpspreadsheet I got this result

2. composer update gave me this

3. Finally,I tried to run the hello-example class as follow:

     require 'vendor/autoload.php';
    class Spread{
   public function fun(){
   $spreadsheet = new Spreadsheet();
   $sheet = $spreadsheet->getActiveSheet();
   $sheet->setCellValue('A1', 'Hello World !');
   
   $writer = new Xlsx($spreadsheet);
   $writer->save('helloz world.xlsx');
   }
   
   

Composer.json

composer.json

via Chebli Mohamed