PHP | DOMElement setAttributeNode() Function

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The DOMElement::setAttributeNode() function is an inbuilt function in PHP which is used to add a new attribute node to element.

Syntax:

DOMAttr DOMElement::setAttributeNode( DOMAttr $attr )

Parameters: This function accepts a single parameter $attr which holds the attribute node to be added.

Return Value: This function returns an DOMAttr value containing old node if the value has been replaced or NULL.

Exceptions: This function throws DOM_NO_MODIFICATION_ALLOWED_ERR, if the node is readonly.

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

Program 1:

<?php 
  
// Create a new DOMDocument 
$dom = new DOMDocument(); 
   
// Create an element 
$node = $dom->createElement("p", 'zambiatek'); 
   
// Add the node to the dom 
$newnode = $dom->appendChild($node); 
   
// Create a DOMAttr instance which 
// increase the font-size 
$attr = new DOMAttr('style', 'font-size: 80px;'); 
  
// Set the attribute 
$newnode->setAttributeNode($attr); 
   
// View the XML 
echo $dom->saveXML(); 
?> 

Output:

<?xml version="1.0"?>
<p style="font-size: 80px;">zambiatek</p>

Program 2:

<?php 
  
// Create a new DOMDocument 
$dom = new DOMDocument(); 
  
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html> 
        <h1 id=\"my_id\"> Geeksforzambiatek </h1> 
        <h2> Second heading </h2> 
    </html> 
</root>"); 
  
// Get the elements 
$node = $dom->getElementsByTagName('h1')[0]; 
   
echo "Before the addition of attributes: <br>"; 
  
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
   
// Create a DOMAttr instance 
$attr = new DOMAttr('class', 'value'); 
  
// Add the new attribute 
$node->setAttributeNode($attr); 
   
echo "<br>After the addition of attributes: <br>"; 
   
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
?> 

Output:

Before the addition of attributes:
No of attributes => 1
After the addition of attributes:
No of attributes => 2

Reference: https://www.php.net/manual/en/domelement.setattributenode.php

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