(PHP 5, PHP 7, PHP 8)
DOMElement::getElementsByTagNameNS — Get elements by namespaceURI and localName
   This function fetch all the descendant elements with a given 
   localName and namespace.
  
namespace
       The namespace URI of the elements to match on.
       The special value "*" matches all namespaces.
       Passing null matches the empty namespace.
      
localName
       The local name of the elements to match on.
       The special value "*" matches all local names.
      
This function returns a new instance of the class DOMNodeList of all matched elements in the order in which they are encountered in a preorder traversal of this element tree.
| 版本 | 说明 | 
|---|---|
| 8.0.3 | 
       namespace is nullable now.
       |