Smart image resizing and thumbnail generation
Example: https://www.codicefacile.it/php/miniature-di-immagini-con-php
Using Composer (recommended) composer.
curl -s https://getcomposer.org/installer | php --
php composer.phar require cvsolutions/smart-image:1.0
If you have installed composer:
composer require cvsolutions/smart-image:1.0