(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.
  
namespaceThe namespace URI.
localName
       The local name. Use * to return all elements within 
       the element tree.
      
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 | namespaceis nullable now. |