(PHP 5, PHP 7)
The DOMImplementation class provides a number of methods for performing operations that are independent of any particular instance of the document object model.
$namespace = ""
, string $qualifiedName = ""
, DOMDocumentType|null $doctype = null
) : DOMDocument|false$qualifiedName
, string $publicId = ""
, string $systemId = ""
) : DOMDocumentType|false