PHP Manual
Language Reference
Basic syntax
Types
Variables
Constants
Expressions
Operators
Control Structures
Functions
Classes and Objects
Namespaces
Enumerations
Errors
Exceptions
Fibers
Generators
Attributes
References Explained
Predefined Variables
Predefined Exceptions
Predefined Interfaces and Classes
Predefined Attributes
Context options and parameters
Supported Protocols and Wrappers

First class callable syntax

Language Reference

Classes and Objects

Table of Contents

Introduction
The Basics
Properties
Class Constants
Autoloading Classes
Constructors and Destructors
Visibility
Object Inheritance
Scope Resolution Operator (::)
Static Keyword
Class Abstraction
Object Interfaces
Traits
Anonymous classes
Overloading
Object Iteration
Magic Methods
Final Keyword
Object Cloning
Comparing Objects
Late Static Bindings
Objects and references
Object Serialization — Serializing objects - objects in sessions
Covariance and Contravariance
Lazy Objects
OOP Changelog