PHP | DOMDocument createAttributeNS() Function

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@geeksforgeeks.org</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.geeksforgeeks.org/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@geeksforgeeks.org</email>
        <mobile>+91-987654321</mobile>
    </contact>
</root>

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

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