Online PHP editor | refs for QCRV6

<?php $data = [ ['id' => 111, 'text' => 'yellow'], ['id' => 111, 'text' => 'red'], ['id' => 112, 'text' => 'green'], ]; $result = array_map(function($item) {return [ 'id' => $item['id'], 'text' => implode(', ', $item['colors']), ];}, array_reduce($data, function($reduced, $item){ if (!isset($reduced[$item['id']])) $reduced[$item['id']] = $item; $reduced[$item['id']]['colors'][] = $item['text']; return $reduced; }, [])); var_dump($result);