No cache version.
Caching disabled. Default setting for this page:enabled (code LNG204)If the display is too slow, you can disable the user mode to view the cached version.
namespace keyword and __NAMESPACE__ constant
(PHP 5 >= 5.3.0, PHP 7)
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.
Example #1 __NAMESPACE__ example, namespaced code
<?php
namespace MyProject;
echo '"', __NAMESPACE__, '"'; // outputs "MyProject"
?>
Example #2 __NAMESPACE__ example, global code
<?php
echo '"', __NAMESPACE__, '"'; // outputs ""
?>
__NAMESPACE__ constant is useful for dynamically constructing
names, for instance:
Example #3 using __NAMESPACE__ for dynamic name construction
<?php
namespace MyProject;
function get($classname)
{
$a = __NAMESPACE__ . '\\' . $classname;
return new $a;
}
?>
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.
Example #4 the namespace operator, inside a namespace
<?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
?>
Example #5 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
?>
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-language.namespaces.nsconstants.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
