This function replaces the child oldnode
with the passed new node. If the new node is already a child it
will not be added a second time. If the replacement succeeds the
old node is returned.
Parameters
newnode
The new node. It must be a member of the target document, i.e.
created by one of the DOMDocument->createXXX() methods or imported in
the document by DOMDocument->importNode().
oldnode
The old node.
Return Values
The old node or FALSE if an error occur.
Exceptions
DOM_NO_MODIFICATION_ALLOWED_ERR
Raised if this node is readonly or if the previous parent of the node
being inserted is readonly.
DOM_HIERARCHY_REQUEST_ERR
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
put in is one of this node's ancestors or this node itself.
DOM_WRONG_DOCUMENT_ERR
Raised if newnode was created from a different
document than the one that created this node.
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