(PHP 8 >= 8.4.0)
Dom\HTMLDocument::saveXml — Serializes the document as an XML string
public Dom\HTMLDocument::saveXml(?Dom\Node $node = null, int $options = 0): string|false
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.
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https://www.php.net/manual/en/dom-htmldocument.savexml.php