Online PHP editor | refs for oqLPI

<?php $array = [ 44259 => [50007, 50009, 46372], 33333 => [11111], 50007 => [50008], 22222 => [33333], 50009 => [50010], 66666 => ['no', 'other', 'links'], 46372 => [46418, 46419, 46421], 46421 => [146880] ]; do { $changes = false; foreach ($array as $k => &$row) { foreach ($row as $v) { if (isset($array[$v])) { array_push($array[$k], ...$array[$v]); unset($array[$v]); $changes = true; } } } } while($changes); var_export($array);