Dynamic Array traversal in PHP

Question

I want to build a hierarchy from a one-dimensional array and can (almost) do so with a more or less hardcoded code. How can I make the code dynamic?

Perhaps with

Answer 1

I THINK you want:

function array_traverse($array, $key = null) {
    $out = (string) $key;
    if (isset($array[$key])) {
        $out = array_traverse($array, $array[$key]) . '/' . $out;
    }
    return $out;
}

Or, for a non-recursive method:

function array_traverse($array, $key = null) {
    $out = (string) $key;
    while(isset($array[$key])) {
        $out = $array[$key] . '/' . $out;
        $key = $array[$key];
    }
    return $out;
}