PHP Handbook by flaviocopes
This PDF covers the following topics related to PHP : Which kind of language is PHP, Setting up PHP, Your first PHP program, PHP language basics, Strings, Built-in functions for numbers, Arrays, Conditionals, Loops, Functions, Looping arrays with map or filter or reduce , Object oriented PHP, Including other PHP files, Useful constants, functions and variables for filesystem, Errors, Exceptions, Dates, Constants and enums, PHP as a web app development platform, Using Composer and Packagist, Deploying PHP applications.
Author(s): flaviocopes
97 Pages 
PHP Reference Beginner to Intermediate PHP 5
This is an excellent book written by Mario Lurig. A collection of over 250 PHP functions with clear explanations in language anyone can understand, followed with as many examples as it takes to understand what the function does and how it works. This book includes numerous additional tips, the basics of PHP, MySQL query examples, regular expressions syntax, and two indexes to help you find information faster.
Author(s): Mario Lurig
163 Pages
This book covers the following topics: PHP 5 Basic Language, PHP 5 OO Language, PHP 5 Advanced OOP and Design Patterns, Write a Web Application with PHP, Databases with PHP 5, Error Handling, XML with PHP 5, Mainstream Extensions, Using PEAR, Important PEAR Packages, Building PEAR Components, Introduction to Writing PHP Extensions, PHP Shell Scripting.
Author(s): Andi Gutmans, Stig Saether Bakken and Derick Rethans
720 Pages
