PHP | DOMNamedNodeMap count() Function

Last Updated : 26 Feb, 2020

The DOMNamedNodeMap::count() function is an inbuilt function in PHP which is used to get the number of nodes in the map. It can be used to count attributes of a element.

Syntax:

int DOMNamedNodeMap::count( void )

Parameters: This function doesn’t accepts any parameter.

Return Value: This function returns and integer value containing the number of nodes in the map.

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

Example 1: In this example we will count the attributes 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\">  
         Geeksforgeeks  
        </h1> 
    </html> 
</root>"); 
   
// Get the elements 
$node = $dom->getElementsByTagName('h1')[0]; 
   
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
?> 

Output:

No of attributes => 3

Example 2: In this example we will check if count function fetches the latest no of attributes or not by altering the number of attributes.

<?php 
  
// Create a new DOMDocument 
$dom = new DOMDocument(); 
   
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html> 
        <h1 id=\"first\" 
            class=\"first\">  
          Geeksforgeeks  
        </h1> 
        <h2> Second heading </h2> 
    </html> 
</root>"); 
   
// Get the elements 
$node = $dom->getElementsByTagName('h1')[0]; 
    
echo "Before the addition of attributes: <br>"; 
   
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
    
// Set the id attribute 
$node->setAttribute('new', 'value'); 
    
echo "<br>After the addition of attributes: <br>"; 
    
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
?> 

Output:

Before the addition of attributes:
No of attributes => 2
After the addition of attributes:
No of attributes => 3

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

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