(PHP 5, PHP 7)
DOMNode::insertBefore — Adds a new child before a reference node
public DOMNode::insertBefore ( DOMNode $newnode [, DOMNode $refnode ] ) : DOMNode
This function inserts a new node right before the reference node. If you plan to do further modifications on the appended child you must use the returned node.
When using an existing node it will be moved.
newnode
The new node.
refnode
The reference node. If not supplied, newnode is appended to the children.
The inserted node.
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 append 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 refnode is not a child of this node.
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https://www.php.net/manual/en/domnode.insertbefore.php