Shift Recursive nested child array to parent array PHP - php

Question

I have an issue with forming a recursive array. That is shifting the child array nodes to direct elements to a parent array.
like from,
Array
(
[0] => Array
(
[id] => 1
[category_name] => flare
[parent_category_id] => 0
[childrenrecursive] => Array
(
[0] => Array
(
[id] => 2
[category_name] => analytics
[parent_category_id] => 1
[braincount] => Array
(
[count] => 3
[category_id] => 2
)
[childrenrecursive] => Array
(
[0] => Array
(
[id] => 4
[category_name] => sports analytics
[parent_category_id] => 2
[braincount] => Array
(
[count] => 4
[category_id] => 4
)
[childrenrecursive] => Array
(
)
)
)
)
[1] => Array
(
[id] => 3
[category_name] => cluster
[parent_category_id] => 1
[braincount] => Array
(
[count] => 4
[category_id] => 3
)
[childrenrecursive] => Array
(
)
)
)
)
)
to,
Array
(
[0] => Array
(
[id] => 1
[category_name] => flare
[parent_category_id] => 0
[childrenrecursive] => Array
(
[0] => Array
(
[id] => 2
[category_name] => analytics
[parent_category_id] => 1
[count] => 3
[category_id] => 2
[childrenrecursive] => Array
(
[0] => Array
(
[id] => 4
[category_name] => sports analytics
[parent_category_id] => 2
[count] => 4
[category_id] => 4
[childrenrecursive] => Array
(
)
)
)
)
[1] => Array
(
[id] => 3
[category_name] => cluster
[parent_category_id] => 1
[count] => 4
[category_id] => 3
[childrenrecursive] => Array
(
)
)
)
)
)
only by moving following child array append to parent in a recursive way.
[braincount] => Array
(
[count] => 4
[category_id] => 3
)
can anybody help me to format the array like specified.

Answer 1

Let's say $input is the array posted in the question:
/**
* If $value is an array then move the content of 'braincount' one level up
* (in $value) then call recursively for all its children.
*/
function moveUp($value)
{
// Not an array? Nothing to do; return the input value unchanged
if (! is_array($value)) {
return $value;
}
// Move the content of 'braincount' (if present) one level up
if (array_key_exists('braincount', $value)) {
$value = array_merge($value, $value['braincount']);
unset($value['braincount']);
}
// Apply the same operation to all children
return array_map(__FUNCTION__, $value);
}
// Verify it works
print_r(moveUp($input));