(PHP 5, PHP 7, PHP 8, PECL tidy >= 0.5.2)
tidy::isXml -- tidy_is_xml — Indicates if the document is a generic (non HTML/XHTML) XML document
Object-oriented style
Procedural style
Tells if the document is a generic (non HTML/XHTML) XML document.
   This function returns true if the specified tidy
   tidy is a generic XML document (non HTML/XHTML),
   or false otherwise.
  
    This function is not yet implemented in the Tidylib itself, so it always
    return false.