It's hard to get away from cloud storage in modern web application development; and with good reason!

Infrastructure as a Service (IaaS) providers such as Amazon Web Services, Microsoft Azure, Google Cloud Platform, and Alibaba Cloud make storing data anywhere in the world almost trivial, regardless of programming language, operating system, and budget.

Whether you're storing instrumentation data from a Raspberry Pi-based weather station, or medical records for a nation-state, cloud providers are up to the task. However, they don't do everything for you. They won’t handle tasks such as only letting valid users store legitimate files.

So in this tutorial, you're going to learn how to use Twilio's Verify API to validate uploads to an Amazon S3 bucket in a Slim framework application which uses the Twig templating engine for the view templates.

Tutorial Requirements

To follow this tutorial you need the following components:

• PHP 7.4, …

Slim is an excellent PHP micro-framework. Out of the box it gives you compatibility with PHP standards (PSRs), PSR-11 for the container, PSR-7 for HTTP messages and PSR-15 for middleware. Its lightweight design gives you the bare minimum to get started with your web application; routing, a middleware dispatcher, error handling and a container. You need to wire up the additional services needed to handle requests and return responses.

But where do we start? Let's take a look at installing a clean installation of Slim from a community skeleton, and add our first component to it; the Twig templating engine.

Starting with Slim

Slim provides a skeleton application that lets you get started quickly, but it's designed more with an API in mind than a web application. I prefer to start with a more lightweight skeleton from Slim maintainer Rob Allen. Rob’s starter comes with PHP-DI dependency …