Recursively Create an Array from another Array - php

Question

I am trying to make a multi-dimensional array build an array path adding the hr field so it looks like this:
I just can't figure out how to add the totals, nor create a sub-array so the dot notation in an option too. My goal is to get something like this:
[1] => [1][2][1][5][0][6] = 35 (the second child path "1")
[1] => [1][2][1][5][0][7] = 25
or Something like this:
array (
[children.0.children.0.children.0.total] = 20
[children.0.children.1.children.1.total] = 35
// etc
)
The complicated part is that it goes in different directions and I want to know what is the highest and lowest total based on the path:
==> Run Code Here or Copy/Paste
// -------------
// The Flattener
// -------------
function doit($myArray) {
$iter = new RecursiveIteratorIterator(new RecursiveArrayIterator($myArray));
$result = array();
foreach ($iter as $leafKey => $leafValue) {
$keys = array();
foreach (range(0, $iter->getDepth()) as $depth) {
$keys[] = $iter->getSubIterator($depth)->key();
}
$result[ join('.', $keys) ] = $leafValue;
}
return $result;
}
// -------------
// Example Tree
// -------------
$tree = [
'id' => 1,
'type' => 'note',
'data' => [],
'children' => [
[
'id' => 2,
'type' => 'wait',
'data' => [
'hr' => 10,
],
'children' => [
[
'id' => 3,
'type' => 'wait',
'data' => [
'hr' => 10,
],
'children' => [
'id' => 4,
'type' => 'exit',
'data' => [],
'children' => []
]
],
[
'id' => 5,
'type' => 'note',
'data' => [
'hr' => 10,
],
'children' => [
[
'id' => 6,
'type' => 'wait',
'data' => [
'hr' => 10,
],
'children' => []
],
[
'id' => 7,
'type' => 'exit',
'data' => [],
'children' => []
],
]
]
],
]
]
];
$result = doit($tree);
print_r($result);

Answer 1

This seems to work, I found it somewhere googling all day.
array_reduce(array_reverse($keys), function($parent_array, $key) {
return $parent_array ? [$key => $parent_array] : [$key];
}, null);