Defining namespaces
Defining namespaces
(PHP 5 >= 5.3.0, PHP 7)
Although any valid PHP code can be contained within a namespace, only the following types of code are affected by namespaces: classes (including abstracts and traits), interfaces, functions and constants.
Namespaces are declared using the namespace keyword. A file containing a namespace must declare the namespace at the top of the file before any other code - with one exception: the declare keyword.
Example #1 Declaring a single namespace
<?php namespace MyProject; const CONNECT_OK = 1; class Connection { /* ... */ } function connect() { /* ... */ } ?>