Pro functional PHP programming : application development strategies for performance optimization, concurrency, testability, and code brevity / Rob Aley.

Part One : Function Programming in PHP 7
1. Introduction
2. Functional Programming
the basics
3. Basic Functional Programming
4. Working with Functions
Part Two : Application Development Strategies
5. Strategies for High Performance Applications
6. Managing Business Logic with Functions
7. Using FP in Object-Oriented & Procedural Applications
8. Using Helper Libraries in Your Application
9. Processing "Big Data" with Functional PHP
10. Afterword: Where to now?
Appendices
A. Installing PHP and Libraries
B. Command Line PHP
C. Functional Programming Resources.