PHP | DOMDocument createAttributeNS() Function

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The DOMDocument::createAttributeNS() function is an inbuilt function in PHP which is used to create a new attribute node with an associated namespace.

Syntax:

DOMAttr DOMDocument::createAttributeNS( string $namespaceURI, string $qualifiedName )

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

$namespaceURI: This parameter holds the URI of the namespace.
$qualifiedName This parameter holds the tag name and prefix of the attribute. For example: prefix:tagname.

Return Value: This function returns a new DOMAttr object on success or FALSE on failure.

Below program illustrates the DOMDocument::createAttributeNS() function in PHP:

Program:

<?php 
  
// Store the XML document to the source 
$source = <<<XML 
<?xml version="1.0" encoding="UTF-8"?> 
<root><contact><email>abc@zambiatek.com</email> 
<mobile>+91-987654321</mobile></contact></root> 
XML; 
  
// Create a new document 
$domDocument = new DOMDocument( '1.0' ); 
  
// Load the XML file 
$domDocument->loadXML( $source ); 
      
// Use createAttributeNS() function to create new attribute 
// node with an associated namespace 
$attrNS = $domDocument->createAttributeNS( 
                '{namespace}', 'info:cont_info' ); 
  
// Create XML document and display it 
echo $domDocument->saveXML() . "\n"; 
  
// Assign value to the createAttributeNS 
$attrNS->value = 'https://www.zambiatek.com/about/contact-us/'; 
  
$domDocument->getElementsByTagName( 'contact' ) 
            ->item(0)->appendChild( $attrNS ); 
      
// Create XML document and display it 
print $domDocument->saveXML() . "\n"; 
      
?> 

Output:

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:info="{namespace}">
    <contact>
        <email>abc@zambiatek.com</email>
        <mobile>+91-987654321</mobile>
    </contact>
</root>

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:info="{namespace}">
    <contact info:cont_info=
        "https://www.zambiatek.com/about/contact-us/">
        <email>abc@zambiatek.com</email>
        <mobile>+91-987654321</mobile>
    </contact>
</root>

Reference: https://www.php.net/manual/en/domdocument.createattributens.php