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Lesson 4 - E-shop in PHP - Controller action design

In the previous lesson, E-shop in PHP - App folder and making the project runnable, we added the last couple of changes needed to our project directory structure and made the project functional again. Although the new architecture makes the project much clearer, the framework still lacks a lot a functionality needed to build a large application. Mainly, our framework suffers from these 2 issues:

  1. Each controller can only perform a single action (the index() method), which leads to either long methods or the exponential growth of the number of controllers alongside the application's complexity. Also, there's no way for a controller to work with an API, e.g. for AJAX.
  2. Real commercial applications are based on forms. Up until now, we've written all of our forms manually, where the templates weren't very pretty (they were large and had us fill the data in manually). We had to manually write in a validation for every single form and implement code that retrieved $_POST data over and over again. This way, if we gave it enough time, we'd type ourselves to death.

Today's tutorial is about modifying the controller's design.


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Article description

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In this tutorial, we'll focus on the last couple of problems in our framework, which are controller actions, the lack of an API, and forms.

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Article has been written for you by David Capka
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
Unicorn university David learned IT at the Unicorn University - a prestigious college providing education on IT and economics.