[snip]The crux of it is:
>    $focus = &$focus[$name];
> [/snip]

It works as I expect so far. All I have to do is figure out how to make the 
element a name: element in the JSON. for instance an element would look like 

   name: "Bob",
   children: []

So the PHP array would have to look like this - 

$json = array (
        name => "Bob",
        children => array (
            name => "Angie"

and so on. This is for one of the services that will consume the JSON.

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