(PHP 5 >= 5.3.0, PHP 7)
Examples:
Declaring a single namespace
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.
<?php
namespace MyProject;
const CONNECT_OK = 1;
class Connection { /* ... */ }
function connect() { /* ... */ }
?>
Declaring a single namespace
<html> <?php namespace MyProject; // fatal error - namespace must be the first statement in the script ?>
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