Question

Let’s say I have an array like this:

Array
(
    [id] => 45
    [name] => john
    [children] => Array
    (
        [45] => Array
            (
                [id] => 45
                [name] => steph
                [children] => Array
                    (
                        [56] => Array
                            (
                                [id] => 56
                                [name] => maria
                                [children] => Array
                                    (
                                        [60] => Array
                                            (
                                                [id] => 60
                                                [name] => thomas
                                            )

                                        [61] => Array
                                            (
                                                [id] => 61
                                                [name] => michelle
                                            )

                                    )
                            )

                        [57] => Array
                            (
                                [id] => 57
                                [name] => luis
                            )

                     )

            )

    )

)

What I’m trying to do is to reset the keys of the array with keys children to 0, 1, 2, 3, and so on, instead of 45, 56, or 57.

I tried something like:

function array_values_recursive($arr)
{
    foreach ($arr as $key => $value)
    {
        if(is_array($value))
        {
            $arr[$key] = array_values($value);
            $this->array_values_recursive($value);
        }
    }

    return $arr;
}

But that reset only the key of the first children array (the one with key 45)

Answer 1

You use a recursive approach but you do not assign the return value of the function call $this->array_values_recursive($value); anywhere. The first level works, as you modify $arr in the loop. Any further level does not work anymore for mentioned reasons.

If you want to keep your function, change it as follows (untested):

function array_values_recursive($arr)
{
  foreach ($arr as $key => $value)
  {
    if (is_array($value))
    {
      $arr[$key] = $this->array_values_recursive($value);
    }
  }

  if (isset($arr['children']))
  {
    $arr['children'] = array_values($arr['children']);
  }

  return $arr;
}