Who this book is for

This book is for programmers who have already used PHP and MySQL in one way or another. It's for people who work with a lot of backend code and want to get up to speed with the world of Twilio. It's for people who want to use the capabilities of Twilio to let their websites handle phone calls and SMS messages.

The book is for both beginners and seasoned developers, assuming that you have some experience in PHP and MySQL already, but an in-depth knowledge is not necessary.