Something I found useful while brushing up on my PHP MVC knowledge was this book by Packt Publishing. It’s called CodeIgniter 1.7 and takes you through the fundamental concepts of MVC within the CodeIgniter framework including a chapter on basic CRUD functions. I’m a big fan of this framework, having worked on a custom MVC framework and CakePHP in my web app building days, and I find it a really great framework to keep my skills sharp while not being frustrated with a steep learning curve.

Check it out: CodeIgniter 1.7 – https://www.packtpub.com/improve-coding-productivity-with-codeigniter-1-7/book