(PHP 5, PHP 7) Adds a new child before a reference node

(PHP 5 >= 5.2.0, PHP 7) Canonicalize nodes to a file

(PHP 5, PHP 7) Checks if the specified namespaceURI is the default namespace or not

(PHP 5, PHP 7) Adds new child at the end of the children

(PHP 5, PHP 7) Indicates if two nodes are the same node

(PHP 5 >= 5.2.0, PHP 7) Canonicalize nodes to a string

(PHP 5, PHP 7) Checks if node has children