(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.
$namespaceURI
= null
[, string $qualifiedName
= null
[, DOMDocumentType $doctype
= null
]]] ) : DOMDocument$qualifiedName
= null
[, string $publicId
= null
[, string $systemId
= null
]]] ) : DOMDocumentType