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This is the official PHP Manual of PHP.net.

Copyright
PHP Manual

Preface

Getting Started

Introduction
A simple tutorial

Installation and Configuration

General Installation Considerations
Installation on Unix systems
Installation on Mac OS X
Installation on Windows systems
Installation of PECL extensions
Problems?
Runtime Configuration

Language Reference

Basic syntax
Types
Variables
Constants
Expressions
Operators
Control Structures
Functions
Classes and Objects (PHP 4)
Classes and Objects (PHP 5)
Namespaces
Exceptions
References Explained
Predefined variables
Predefined Exceptions
Context options and parameters

Security

Introduction
General considerations
Installed as CGI binary
Installed as an Apache module
Filesystem [...]