Online PHP editor | refs for RoOVf

<?php $array = [ 1 => [ 1 => [ 'anna', 'alice' ], 2 => [ 'bob', 'bartold' ] ], 2 => [ 1 => [ 'carol' ], 2 => [ 'david' ] ] ]; $result = []; $iterator = new \RecursiveIteratorIterator( new \RecursiveArrayIterator($array) ); foreach ($iterator as $row) { $result[] = $row; } //array_walk_recursive($array, function ($e) use (&$result) {$result[] = $e;}); var_dump($result);