(PHP 4.2) This function replaces an existing node with the passed
new node. Before the replacement
newnode
is copied if it has a parent to
make sure a node which is
already in the document will not be inserted a second time. This
behaviour enforces doing all modifications on the node before the
replacement or to refetch the inserted node afterwards with functions like
domnode_first_child(),
domnode_child_nodes() etc..
(PHP 4.3) This function replaces an existing node with the passed new node. It is not
copied anymore. If newnode
was already inserted in the document
it is first unlinked from its existing context. If the replacement succeeds the old
node is returned.