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<?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);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [111]=> array(2) { ["id"]=> int(111) ["text"]=> string(11) "yellow, red" } [112]=> array(2) { ["id"]=> int(112) ["text"]=> string(5) "green" } }

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