How to Use "Root" Namespace of PHP

How to use root namespace of php?

What can I do to make this work ?

Use a leading backslash to indicate the global namespace:

namespace abc;

class AbcException extends \Exception {
// blah blah
}

Useful documents are appreciated.

There's an entire page devoted to this in the PHP manual!

PHP Root namespace

namespace 
{ 
    class RootClass
    {

        function whatever();
    }
}
namespace Symfony\Component\DependencyInjection
{
    interface ContainerAwareInterface
    {

        function setContainer(ContainerInterface $container = null);
    }
}

http://www.php.net/manual/en/language.namespaces.definitionmultiple.php

Good chance you will decide to use separate files anyways.

PHP use root namespace within another namespace without backslash

Regardless of whether the namespace is "root" or not, you cannot import an entire namespace using use. The best you can do is:

use A;

Get Namespace Name in Root Element via PHP SimpleXMLElement

"However, I really like to know the name of the namespace. In other words, I do not know which function to call that returs xmlns".

xmlns is XML syntax for default attribute name for namespace declaration. It isn't clear what you're trying to verify, but I think it is safe to assume that if getNamespaces() returns namespace which prefix is empty then the source XML has a valid default namespace (in other words, the source XML has xmlns).

Quoting from W3C "Namespaces in XML" for easy reference :

1. If the attribute name matches DefaultAttName, then the namespace name in the attribute value is that of the default namespace in the scope of the element to which the declaration is attached. In such a default declaration, the attribute value may be empty. Default namespaces and overriding of declarations are discussed in "5. Applying Namespaces to Elements and Attributes".
   [Default Namespace]

2. [3] DefaultAttName ::= 'xmlns' .
   [Default Attribute Name]

how to use namespace in wordpress, while use its root file class

As Chris Morris suggestion i am writing answer here.

namespace Example\Test;

require_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );

class newTest {
  public function __construct(){
   $upgrader = new \Plugin_Upgrader();
 }
}
/**************************************/
namespace Example\Test;

 include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );

 class Example_Upgrader_Skin extends \WP_Upgrader_Skin {

    public function feedback( $string ) {
         // @note: Keep it empty.
  }
 }

---

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