(PHP 5, PHP 7)
DOMNode::isSameNode — Indicates if two nodes are the same node
public DOMNode::isSameNode ( DOMNode $node ) : bool
This function indicates if two nodes are the same node. The comparison is not based on content
node
The compared node.
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/domnode.issamenode.php