PHP | DOMNamedNodeMap getNamedItem() Function

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The DOMNamedNodeMap::getNamedItem() function is an inbuilt function in PHP which is used to retrieve a node specified by name. This is used to get the attribute items and further get information about the attribute.

Syntax:

DOMNode DOMNamedNodeMap::getNamedItem( string $name )

Parameters: This function accepts a single parameter $name which holds the nodeName of the node to retrieve.

Return Value: This function returns DOMNode with the specified name on success.

Below examples illustrate the DOMNamedNodeMap::getNamedItem() function in PHP:

Example 1: In this example we will get the attribute value of a element.

<?php 
   
// Create a new DOMDocument 
$dom = new DOMDocument(); 
    
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html> 
        <h1 id=\"first\"  
            class=\"first\"  
            style=\"color: blue\">  
         Geeksforzambiatek  
        </h1> 
    </html> 
</root>"); 
    
// Get the elements 
$node = $dom->getElementsByTagName('h1')[0]; 
    
// Get the attribute value 
$attribute = $node->attributes-> 
    getNamedItem('style')->nodeValue; 
echo $attribute; 
?> 

Output:

color: blue

Example 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(); 
     
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html> 
        <h1 id=\"first\"  
            class=\"first\"> 
         Geeksforzambiatek  
        </h1> 
        <h2> Second heading </h2> 
    </html> 
</root>"); 
     
// Get the elements 
$node = $dom->getElementsByTagName('h1')[0]; 
      
echo "Before: <br>"; 
     
// Get the attribute value 
$attribute = $node->attributes-> 
     getNamedItem('class')->nodeValue; 
echo $attribute; 
      
// Change the value of attribute 
$node->setAttribute('class', 'changed'); 
      
echo "<br>After: <br>"; 
   
// Get the attribute value 
$attribute = $node->attributes-> 
    getNamedItem('class')->nodeValue; 
echo $attribute; 
?> 

Output:

Before:
first
After:
changed

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

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