Node::insertAfter

public function insertAfter(Node $next)
{
	if($this->next instanceof Node && $next->next instanceof Node)
	{
		throw new ArgumentException("This node and inserted node can not both have `next` property set.");
	}

	if($this->next instanceof Node)
	{
		$next->setNext($this->next);
	}

	$this->next = $next;
}