(PHP 5, PHP 7)
DOMDocument::createComment — Create new comment node
public DOMDocument::createComment ( string $data ) : DOMComment
This function creates a new instance of class DOMComment. This node will not show up in the document unless it is inserted with (e.g.) DOMNode::appendChild().
data
The content of the comment.
The new DOMComment or false if an error occurred.
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https://www.php.net/manual/en/domdocument.createcomment.php