(PHP 5 >= 5.3.0, PHP 7)
Examples:
__NAMESPACE__ example, namespaced code
PHP supports two ways of abstractly accessing elements within the current namespace, the __NAMESPACE__ magic constant, and the namespace keyword.
The value of __NAMESPACE__ is a string that contains the current namespace name. In global, un-namespaced code, it contains an empty string.
<?php namespace MyProject; echo '"', __NAMESPACE__, '"'; // outputs "MyProject" ?>
__NAMESPACE__ example, global code
<?php echo '"', __NAMESPACE__, '"'; // outputs "" ?>
using __NAMESPACE__ for dynamic name construction
<?php
namespace MyProject;
function get($classname)
{
$a = __NAMESPACE__ . '\\' . $classname;
return new $a;
}
?>
the namespace operator, inside a namespace
The namespace keyword can be used to explicitly request an element from the current namespace or a sub-namespace. It is the namespace equivalent of the self operator for classes.
<?php namespace MyProject; use blah\blah as mine; // see "Using namespaces: Aliasing/Importing" blah\mine(); // calls function MyProject\blah\mine() namespace\blah\mine(); // calls function MyProject\blah\mine() namespace\func(); // calls function MyProject\func() namespace\sub\func(); // calls function MyProject\sub\func() namespace\cname::method(); // calls static method "method" of class MyProject\cname $a = new namespace\sub\cname(); // instantiates object of class MyProject\sub\cname $b = namespace\CONSTANT; // assigns value of constant MyProject\CONSTANT to $b ?>
the namespace operator, in global code
<?php namespace\func(); // calls function func() namespace\sub\func(); // calls function sub\func() namespace\cname::method(); // calls static method "method" of class cname $a = new namespace\sub\cname(); // instantiates object of class sub\cname $b = namespace\CONSTANT; // assigns value of constant CONSTANT to $b ?>
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