DB::transaction throw Undefined variable Error Exception

Working on Laravel 5 DB::transaction but throwing following error:

exception 'ErrorException' with message 'Undefined variable: tasks'

Here is my code:

private function addTasks($tasks, $id) {
  DB::transaction(function() {
    DB::table('task')->whereIn('id', $tasks)->update(array('task_parent_id' => $id));
  });
}

I've checked every line of code but found nothing wrong, please let me know where did wrong?

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