Need iterator advice to traverse tree?

You simply need to implement the RecursiveIterator interface. Then, you can iterate over it using the concrete RecursiveIteratorIterator .

You have to start at the root node and recursively traverse each $this->getChildren() (of the nodes and the subnodes (and their subnodes (and their subnodes (and their subnodes)))) (recursion) until it is null. This will result in something like this.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.