Kdyby/Events requires PHP 5.3.2 or higher.
Kdyby/Events are also compatible with events dispatcher in doctrine/common, so you can use them with Doctrine.
The best way to install Kdyby/Events is using Composer:
$ composer require kdyby/events:~2.2Learn more in the documentation.
Homepage http://www.kdyby.org and repository http://github.com/kdyby/events.