Installation of PhpSpreadsheet in CodeIgniter using Composer - YouTube
Architecture - PhpSpreadsheet Documentation
Architecture - PhpSpreadsheet Documentation
Class "PhpOffice\PhpSpreadsheet\IOFactory" not found [#3381342] | Drupal.org
Generating excel file using PHP - Suresh Kamrushi - Medium
PHP : Composer require phpoffice/phpspreadsheet doesn't work - YouTube
phpstorm - Is it possible to install the dependencies you have in composer.json file without you have composer as tool in you machine? - Stack Overflow
Where is the download? · Issue #1720 · PHPOffice/PhpSpreadsheet · GitHub