PHP | DOMNode isSameNode() Function

The DOMNode::isSameNode() function is an inbuilt function in PHP which indicates if two nodes are the same node or not.

Syntax:

bool DOMNode::isSameNode( DOMNode $node )

Parameters: This function accepts a single parameter $node which holds the node to be compared.

Return Value: This function returns TRUE on success or FALSE on failure.

Below given programs illustrate the DOMNode::isSameNode() function in PHP:

Program 1:

<?php

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

// Create a paragraph element with a namespace
$p_element = $dom->createElementNS(
      'my_namespace', 'p', 'GeeksforGeeks');

// Append the child to DOMDocument
$dom->appendChild($p_element);

// Check if the node is same
$isSameNode = $dom->isSameNode($dom);

// Check if the namespace is default or not
if($isSameNode) {
    echo 'Yes, $dom is same to itself.';
}
?>

Output:

Yes, $dom is same to itself.

Program 2:

<?php

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

// Create a paragraph element with a namespace
$p_element = $dom->createElementNS(
      'my_namespace', 'p', 'GeeksforGeeks');

// Append the child to DOMDocument
$dom->appendChild($p_element);

// Create another new DOMDocument instance
$dom2 = new DOMDocument();

// Check if nodes are same
$isSameNode = $dom->isSameNode($dom2);

// Check if the namespace is default or not
if(!$isSameNode) {
    echo 'No, $dom and $dom2 are different.';
}
?>

Output:

No, $dom and $dom2 are different.

Reference: https://www.php.net/manual/en/domnode.issamenode.php