DomNode->replace_child Replaces a child objectDomNode->replace_child objectoldnode objectnewnode (PHP 4.2) 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 old node cannot be found the function returns &false;. If the replacement succeeds the old node is returned. (PHP 4.3) This function replaces the child oldnode with the passed newnode, even if the new node already is a child of the DomNode. If newnode was already inserted in the document it is first unlinked from its existing context. If the old node cannot be found the function returns &false;. If the replacement succeeds the old node is returned. (This behaviour is according to the W3C specs). See also domnode_append_child