(PHP 5, PHP 7)
DOMNode::replaceChild — Replaces a child
public DOMNode::replaceChild ( DOMNode $newnode , DOMNode $oldnode ) : DOMNode
This function replaces the child oldnode with the passed new node. If the newnode is already a child it will not be added a second time. If the replacement succeeds the old node is returned.
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.
The old node or false if an error occur.
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.
DOM_NOT_FOUND
Raised if oldnode is not a child of this node.
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https://www.php.net/manual/en/domnode.replacechild.php