Online PHP editor | refs for uKi1A

<?php $array = [ 2 => [ 'position' => 0, 'children' => [ 3 => ['position' => "375"], 5 => ['position' => "44"], 6 => ['position' => "567"], 9 => [ 'position' => "12", 'children' => [ 74 => ['position' => "2"], 76 => ['position' => "3"], 77 => ['position' => "1"], ] ], 62 => ['position' => "34"], 63 => ['position' => "11"], 66 => ['position' => "114"], 74 => ['position' => "912"], 76 => ['position' => "4564"], ] ] ]; function recur(&$data): void { uasort($data, fn($a, $b) => $a['position'] <=> $b['position']); foreach($data as &$value){ if (isset($value['children'])) { recur($value['children']); } } } recur($array); var_export($array);