PHP Manual
Language Reference
Basic syntax
Types
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Expressions
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Control Structures
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Classes and Objects
Namespaces
Errors
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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