Online PHP editor | refs for HVVbL

<?php $topics = [ [ "id" => 1, "statusName" => "COMPLETED", "lessons" => [ [ "id" => 1, "statusName" => "COMPLETED" ], [ "id" => 1, "statusName" => "COMPLETED" ], ] ], [ "id" => 2, "statusName" => "SCHEDULED", "lessons" => [ [ "id" => 1, "statusName" => "SCHEDULED" ], [ "id" => 1, "statusName" => "COMPLETED" ], ] ] ]; foreach ($topics as $key => $value) { $topics[$key]['lessons'] = array_map(function ($lesson) use ($value) { $lesson['reschedule'] = true; return $lesson; }, $value['lessons']); } var_dump($topics);