(PHP 5, PHP 7)
dom_import_simplexml — Gets a DOMElement object from a SimpleXMLElement object
dom_import_simplexml ( SimpleXMLElement $node ) : DOMElement
 This function takes the node node of class SimpleXML and makes it into a DOMElement node. This new object can then be used as a native DOMElement node. 
node
The SimpleXMLElement node.
 The DOMElement node added or false if any errors occur. 
Example #1 Import SimpleXML into DOM with dom_import_simplexml()
<?php
$sxe = simplexml_load_string('<books><book><title>blah</title></book></books>');
if ($sxe === false) {
    echo 'Error while parsing the document';
    exit;
}
$dom_sxe = dom_import_simplexml($sxe);
if (!$dom_sxe) {
    echo 'Error while converting XML';
    exit;
}
$dom = new DOMDocument('1.0');
$dom_sxe = $dom->importNode($dom_sxe, true);
$dom_sxe = $dom->appendChild($dom_sxe);
echo $dom->saveXML();
?> 
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    https://www.php.net/manual/en/function.dom-import-simplexml.php