(PHP 8 >= 8.4.0)
Dom\HTMLDocument::saveXmlFile — Serializes the document as an XML file
Serializes the document as an XML file.
filenameoptionsLIBXML_NOEMPTYTAG
 and LIBXML_NOXMLDECL options are supported.
 Prior to PHP 8.3.0, only the LIBXML_NOEMPTYTAG
 option is supported.
    
   The number of bytes written on success, or false on failure.
  
filename is an empty string or contains any
     null bytes.
    
   