(PHP 8 >= 8.4.0)
Dom\HTMLDocument::saveXml — Serializes the document as an XML string
Serializes the document as an XML string.
nodeoptionsLIBXML_NOEMPTYTAG
 and LIBXML_NOXMLDECL options are supported.
 Prior to PHP 8.3.0, only the LIBXML_NOEMPTYTAG
 option is supported.
    
   The serialized XML document string in the current
   document encoding, or false on failure.
  
Dom\WRONG_DOCUMENT_ERR if node
  is from another document.
 
