PHP | DOMElement getElementsByTagNameNS() Function

0 0 1 minute read

The DOMElement::getElementsByTagNameNS() function is an inbuilt function in PHP which is used to get all the descendant elements with a given localName and namespaceURI.

Syntax:

DOMNodeList DOMElement::getElementsByTagNameNS( 
          string $namespaceURI, string $localName )

Parameters: This function accept two parameters as mentioned above and described below:

$namespaceURI: It specifies the namespace URI.
$localName: It specifies the local name.

Return Value: This function returns a DOMNodeList value containing all matched elements in the order in which they are encountered in a preorder traversal of this element tree.

Below given programs illustrate the DOMElement::getElementsByTagNameNS() function in PHP:

Program 1:

<?php 
// Create a new DOMDocument 
$dom = new DOMDocument(); 
   
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <div xmlns:x=\"my_namespace\"> 
        <x:h1 x:style=\"color:red;\"> 
            Hello, this is my red heading. 
        </x:h1> 
        <x:h1 x:style=\"color:green;\"> 
            Hello, this is my green heading. 
        </x:h1> 
        <x:h1 x:style=\"color:blue;\"> 
            Hello, this is my blue heading. 
        </x:h1> 
    </div> 
    <div xmlns:y=\"another_namespace\"> 
        <y:h1 y:style=\"color:red;\"> 
            Hello, this is my new red heading. 
        </y:h1> 
        <y:h1 y:style=\"color:green;\"> 
            Hello, this is my new green heading. 
        </y:h1> 
        <y:h1 y:style=\"color:blue;\"> 
            Hello, this is my new blue heading. 
        </y:h1> 
    </div> 
</root>"); 
   
// Get the elements with h1 tag from 
// specific namespace 
$nodeList = $dom->getElementsByTagNameNS( 
                    'my_namespace', 'h1'); 
  
foreach ($nodeList as $node) { 
    echo $node->getAttribute('x:style') . '<br>'; 
} 
?> 

Output:

color:red;
color:green;
color:blue;

Program 2:

<?php 
  
// Create a new DOMDocument 
$dom = new DOMDocument(); 
   
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <div xmlns:x=\"my_namespace\"> 
        <x:p>HELLO.</x:p> 
        <x:p>NEW.</x:p> 
        <x:p>WORLD.</x:p> 
    </div> 
    <div xmlns:y=\"g4g_namespace\"> 
        <y:p>GEEKS</y:p> 
        <y:p>FOR</y:p> 
        <y:p>GEEKS</y:p> 
    </div> 
</root>"); 
   
// Get the elements 
$nodeList = $dom->getElementsByTagNameNS( 
                    'g4g_namespace', 'p'); 
  
foreach ($nodeList as $node) { 
    echo $node->textContent . '<br>'; 
} 
?> 