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PHP | DOMNamedNodeMap getNamedItemNS() function

  • Last Updated : 19 Feb, 2020

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", 'GeeksforGeeks');
  
// 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;
?>

Output:

Before:
color:blue
After:
color:red

Reference: https://www.php.net/manual/en/domnamednodemap.getnameditemns.php




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