PHP | DOMElement setIdAttributeNS() Function

<?php

// Create a new DOMDocument
$dom = new DOMDocument();

// Enable validate on parse
$dom->validateOnParse = true;
  
// Create an element
$element = $dom->createElementNS("my_namespace", "x:p", 
                         'Hello, this is my paragraph.');
  
// Add the node to the dom
$newnode = $dom->appendChild($element);
  
// Set the attribute
$newnode->setAttributeNS("my_namespace", "id", "my_value");

// Set that attribute as id
$element->setIDAttributeNS("my_namespace", 'id', true);
  
echo $dom->saveXML();
?>

<?php
// Create a new DOMDocument
$dom = new DOMDocument();

// Enable validate on parse
$dom->validateOnParse = true;
  
// Create an element
$element = $dom->createElementNS("my_namespace", "x:p", 
                                       'GeeksforGeeks');
  
// Add the node to the dom
$newnode = $dom->appendChild($element);
  
// Set the attribute
$newnode->setAttributeNS("my_namespace", "id",
                                       "geeksforgeeks");

// Set that attribute as id
$element->setIDAttributeNS("my_namespace", 'id', true);

// Get the text of element with id='geeksforgeeks'
// just to see if it works
$value = $dom->getElementById('geeksforgeeks')->textContent;
echo $value;
?>