PHP | DOMNamedNodeMap getNamedItemNS() function

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The DOMNamedNodeMap::getNamedItemNS() function is an inbuilt function in PHP which is used to retrieve a node with a specific local name and namespace URI. This function can be used to get the value of a attribute from a specific namespace.

Syntax:

DOMNode DOMNamedNodeMap::getNamedItemNS
( string $namespaceURl, string $localName )

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

$namespaceURl: It specifies the namespace URI.
$localName: It specifies the local name.

Return Value: This function returns a node with given local name and namespace URI.

Below given programs illustrate the DOMNamedNodeMap::getNamedItemNS() function in PHP:

Program 1: In this example, we will get the attribute value of a element with two different namespaces.

<?php 
// Create a new DOMDocument 
$dom = new DOMDocument(); 
  
// Create an element with namespace 
$node = $dom->createElementNS( 
   "my_namespace", "x:p", 'Hello, this is my paragraph.'); 
  
// Add the node to the dom 
$newnode = $dom->appendChild($node); 
  
// Set the attribute with a namespace 
$newnode->setAttributeNS("my_namespace", "style", "color:blue"); 
  
echo "<b>Attributes with my_namespace as namespace:</b> <br>"; 
  
// Get the attribute value 
$attribute =  
   $node->attributes->getNamedItemNS('my_namespace', 'style')->nodeValue; 
echo $attribute; 
  
echo "<br><b>Attributes with other_namespace as namespace:</b> <br>"; 
  
// Get the attribute value 
$attribute =  
   $node->attributes->getNamedItemNS('other_namespace', 'style')->nodeValue; 
echo $attribute; 
?> 

Output:

Attributes with my_namespace as namespace:
color:blue
Attributes with other_namespace as namespace:
// Empty string means no attributes found.

Program 2: In this example we will check if the function fetches the latest attribute values or not by altering the value of attribute.

<?php 
// Create a new DOMDocument 
$dom = new DOMDocument(); 
  
// Create an element 
$node = $dom->createElementNS("my_namespace", "x:p", 'zambiatek'); 
  
// Add the node to the dom 
$newnode = $dom->appendChild($node); 
  
// Set the attribute with a namespace 
$newnode->setAttributeNS("my_namespace", "style", "color:blue"); 
  
echo "<b>Before:</b> <br>"; 
  
// Get the attribute value 
$attribute =  
    $node->attributes->getNamedItemNS('my_namespace', 'style')->nodeValue; 
echo $attribute; 
  
// Change the attribute value  
$newnode->setAttributeNS("my_namespace", "style", "color:red"); 
  
echo "<br><b>After:</b> <br>"; 
  
// Get the attribute value 
$attribute =  
    $node->attributes->getNamedItemNS('my_namespace', 'style')->nodeValue; 
echo $attribute; 
?> 