Directory

Functional PHP

This book will show you how to leverage these new PHP5.3+.

Grumpy PHPUnit

Grumpy PHPUnit is a unit testing awesome book by Chris Hartjes.

Mastering OOP

A book about object-orientated PHP by Brandon Savage.

Modern PHP New Features

A book about PHP best practices by Josh Lockhart.

Modernising Legacy Applications

A book about modernising legacy PHP applications.

PHP 7 Upgrade Guide

An ebook covering all of the features and changes in PHP 7.