Basic example of use :
<?xml version="1.0" encoding="UTF-8"?>
<racine version="2.0a">
  <article/>
</racine>
<?php
(...)
 echo $doc->documentElement->attributes->getNamedItem("version")->nodeValue;
// returns "2.0a"
?>
(PHP 5, PHP 7)
DOMNamedNodeMap::getNamedItem — Retrieves a node specified by name
Retrieves a node specified by its nodeName.
nameThe nodeName of the node to retrieve.
   A node (of any type) with the specified nodeName, or 
   NULL if no node is found.
  
Basic example of use :
<?xml version="1.0" encoding="UTF-8"?>
<racine version="2.0a">
  <article/>
</racine>
<?php
(...)
 echo $doc->documentElement->attributes->getNamedItem("version")->nodeValue;
// returns "2.0a"
?>
