Building new multidimensional array from multidimensional array and interpreting the order - php

Question

I have been trying to get this to work for 7.5 hours now, but my brain has melted.
I have a multi-dimensional array similar to the following:
array (
'expanded' => true,
'key' => 'root_1',
'title' => 'root',
'children' =>
array (
0 =>
array (
'folder' => false,
'key' => '_1',
'title' => 'News',
'data' =>
array (
'id' => '3',
'parent_id' => 0,
),
),
1 =>
array (
'folder' => true,
'key' => '_2',
'title' => 'Animations',
'data' =>
array (
'id' => '5',
'parent_id' => '0',
),
'children' =>
array (
0 =>
array (
'folder' => false,
'key' => '_3',
'title' => 'The Simpsons',
'data' =>
array (
'id' => '1',
'parent_id' => '5',
),
),
1 =>
array (
'folder' => false,
'key' => '_4',
'title' => 'Futurama',
'data' =>
array (
'id' => '4',
'parent_id' => '5',
),
),
),
),
2 =>
array (
'folder' => true,
'key' => '_5',
'title' => 'Episodes',
'data' =>
array (
'id' => '6',
'parent_id' => '0',
),
'children' =>
array (
0 =>
array (
'folder' => true,
'key' => '_6',
'title' => 'UK Episodes',
'data' =>
array (
'id' => '7',
'parent_id' => '6',
),
'children' =>
array (
0 =>
array (
'folder' => false,
'key' => '_7',
'title' => 'Coupling',
'data' =>
array (
'id' => '2',
'parent_id' => '7',
),
),
),
),
1 =>
array (
'folder' => true,
'key' => '_8',
'title' => 'AU Episodes',
'data' =>
array (
'id' => '8',
'parent_id' => '6',
),
),
),
),
),
)
I need to search through all sub arrays and build a new array returning the id and parent_id of each of the children AND also interpreting the order of the array children from the order they appear in the original array.
The output needs to end up something like this:
Array
(
[0] => Array
(
[id] => 1
[parent_id] => 5
[order] => 1
)
[1] => Array
(
[id] => 2
[parent_id] => 7
[order] => 1
)
[2] => Array
(
[id] => 4
[parent_id] => 5
[order] => 2
)
)
I have tried the following recursion approach, however my code turns into a mess, and thats before I've even attempted to set the order of the items.
I've also searched stackoverflow for another example that I could learn from however I haven't found anything yet... If there is another example please feel free to point me in the right direction.
I appreciate any assistance!

Answer 1

A super easy way to run over all these is to use a RecursiveIteratorIterator over a RecursiveArrayIterator, pluck out the 'data' arrays and add in the key as the order.
Example:
$array = []; // Your starting array with stuff in it.
$iterator = new RecursiveIteratorIterator(
new RecursiveArrayIterator($array),
RecursiveIteratorIterator::SELF_FIRST
);
$result = [];
foreach ($iterator as $key => $value) {
if (isset($value['data'])) {
$result[] = array_merge($value['data'], ['order' => $key]);
}
}
print_r($result);
Output:
Array
(
[0] => Array
(
[id] => 3
[parent_id] => 0
[order] => 0
)
[1] => Array
(
[id] => 5
[parent_id] => 0
[order] => 1
)
[2] => Array
(
[id] => 1
[parent_id] => 5
[order] => 0
)
[3] => Array
(
[id] => 4
[parent_id] => 5
[order] => 1
)
[4] => Array
(
[id] => 6
[parent_id] => 0
[order] => 2
)
[5] => Array
(
[id] => 7
[parent_id] => 6
[order] => 0
)
[6] => Array
(
[id] => 2
[parent_id] => 7
[order] => 0
)
[7] => Array
(
[id] => 8
[parent_id] => 6
[order] => 1
)
)

Answer 2

If i'm understanding what you're trying to do properly the below snippet should work. No need for the order key in each sub array because that's recorded automatically when you insert a new array index into $new_array.
Let me know if you have any other problems.
$new_array = [];
$current_array = []; //with all your data
foreach($current_array['children'] as $array) {
$new_array[] = [
'id' => $array['data']['id'],
'parent_id' => $array['data']['parent_id'];
];
}