PHP | DOMElement getAttributeNS() Function

Last Updated : 26 Feb, 2020
The DOMElement::getAttributeNS() function is an inbuilt function in PHP which is used to get the value of the attribute in a specific namespace with local name for the current node. Syntax: 
string DOMElement::getAttributeNS( string $namespaceURI, 
string $localName )
Parameters: This function accepts 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 string value containing the value of attribute, or an empty string if no attribute with the given localName and namespaceURI is found. Below examples illustrate the DOMElement::getAttributeNS() function in PHP: Example 1: php 
<?php

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

// Load the XML
$dom->loadXML("<?xml version=\"1.0\"?>
<body xmlns:x=\"my_namespace\">
    <x:div x:attr=\"value\" > DIV 1 </x:div>
</body>");

// Get the elements by tagname
$elements = $dom->getElementsByTagName('div');

// Get the attribute node value
$nodeValue = $elements[0]->getAttributeNS('my_namespace', 'attr');

echo $nodeValue;
?>
Output: 
value
Example 2: php 
<?php

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

// Load the XML
$dom->loadXML("<?xml version=\"1.0\"?>
<root>
<body xmlns:x=\"my_namespace1\">
    <x:div x:id=\"my_id1\" > DIV 1 </x:div>
    <x:div x:id=\"my_id2\" > DIV 1 </x:div>
</body>
<body xmlns:xi=\"my_namespace2\">
    <xi:div xi:id=\"new\" > DIV 1 </xi:div>
</body>
</root>");

// Get the elements by tagname
$elements = $dom->getElementsByTagName('div');

foreach ($elements as $element) {

    // Get node value only from my_namespace1
    $nodeValue = $element->getAttributeNS('my_namespace1', 'id');

    if ($nodeValue) {
       echo $nodeValue . '<br>';
    }
}
?>
Output: 
my_id1
my_id2
Reference: https://www.php.net/manual/en/domelement.getattributens.php
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