DOMNode::appendChild — Adds new child at the end of the children
This function appends a child to an existing list of children or creates a new list of children. The child can be created with e.g. DOMDocument::createElement(), DOMDocument::createTextNode() etc. or simply by using any other node.
The appended child.
The node added.
Raised if this node is readonly or if the previous parent of the node being inserted is readonly.
Raised if this node is of a type that does not allow children of the type of the
newnode node, or if the node to append is one of this node's ancestors or this node itself.
newnode was created from a different document than the one that created this node.
The following example will add a new element node to a fresh document.
Example #1 Adding a child
$doc = new DOMDocument;
$node = $doc->createElement("para");
$newnode = $doc->appendChild($node);