On the Master Zend Framework site there's a tutorial posted showing you how to set up file download functionality in a Zend Expressive-based application.

A common requirement of web-based applications is to upload and download files. But, out of the box, there’s no simple way to download them in Zend Expressive. This tutorial shows you how - step-by-step.

Recently, I was asked on Twitter by @dgoosens, about how to download files using Zend Expressive. The timing was pretty good, as I’d done a simple implementation in a recent Zend Expressive project. So I knocked up a quick example and he, @acelayaa, and I talked it over, making various changes and suggestions along the way.

So, In today’s tutorial, I’m going to walk through a 3-step process for downloading files when using Zend Expressive.

He breaks the process down into three parts:

• 1. The Download Functionality
• 2. Using the Download Method
• 3. Running the Application & Downloading the File

He includes code or commands for each step, showing you exactly how to set up this simple piece of functionality. Additionally it's implemented as a (mostly) self-contained method using the Stream handler to set the required headers and body.