DomNode->add_namespace
(PHP 4 >= 4.3.0)
DomNode->add_namespace — Adds a namespace declaration to a node
Description
    bool DOMNode::add_namespace
     ( string $uri
    , string $prefix
    )
  This method adds a namespace declaration to a node.
Note:
This method is not part of the DOM specification.
Parameters
- uri
- 
      The namespace URI of the node. 
- prefix
- 
      The namespace prefix of the node. 
Return Values
Returns TRUE on success or FALSE on failure.
Migrating to PHP 5
You can set the namespace URI and prefix of a DOMElement or a DOMAttr at creation time by using DOMDocument::createElementNS or DOMDocument::createAttributeNS.
Note:
Remember the an attribute does not inherit its namespace from the element it is attached to.