PHP Manual
Language Reference
Basic syntax
Types
Variables
Constants
Expressions
Operators
Control Structures
Functions
Classes and Objects
Namespaces
Exceptions
Generators
References Explained
Predefined Variables
Predefined Exceptions
Predefined Interfaces and Classes
Context options and parameters
Supported Protocols and Wrappers
OOP Changelog
Namespaces overview
Language Reference
PHP Manual
Namespaces
Table of Contents
Namespaces overview
Defining namespaces
Declaring sub-namespaces
Defining multiple namespaces in the same file
Using namespaces: Basics
Namespaces and dynamic language features
namespace keyword and __NAMESPACE__ constant
Using namespaces: Aliasing/Importing
Global space
Using namespaces: fallback to global function/constant
Name resolution rules
FAQ: things you need to know about namespaces