Functional Programming in PHP will show you how to leverage these new language features by understanding functional programming principles. With over twice as much content as its predecessor, this second edition expands upon its predecessor with updated code examples and coverage of advances in PHP 7 and Hack. Plenty of examples are provided in each chapter to illustrate each concept as it’s introduced and to show how to implement it with PHP. You’ll learn how to use map/reduce, currying, composition, and more. You’ll see what external libraries are available and new language features are proposed to extend PHP’s functional programming capabilities.