Online PHP editor | refs for v3kPW

<?php $array = [ ['type' => 'AAA', 'label_id' => 'A1,35'], ['type' => 'AAA', 'label_id' => 'A2,34'], ['type' => 'BBB', 'label_id' => 'B1,29'], ['type' => 'CCC', 'label_id' => 'C1,20'], ['type' => 'CCC', 'label_id' => 'C2,19'], ['type' => 'CCC', 'label_id' => 'C3,18'] ]; $result = []; foreach ($array as $row) { $result[$row['type']]['type'] ??= $row['type']; $result[$row['type']]['label_id'][] = $row['label_id']; } var_export(array_values($result));