On the Zend Framework blog Enrico Zimuel has posted a tutorial showing you how to easily create ZPKs and package up your application for deployment on Zend Server.

Zend Server provides the ability to deploy applications to a single server or cluster of servers via the ZPK package format. We have offered zf-deploy for creating these packages from Zend Framework and Apigility applications, but how can you create these for Expressive, or, really, any PHP application?

They start by listing out some of the requirements you'll need to get started (the zip binary, Composer, etc). The tutorial then walks you through the setup including the contents of the .htaccess and deployment.xmlconfiguration files. It then walks through the installation of dependencies and actually creating the ZFK (via the zip binary). It wraps up with a simple example of the creation of a ZPK containing a single index.php file.