如何删除cookie

// 设置客户端cookie
if ($remember) {
$response->cookie('remember_me', 1, 3600 * 24 * 7, '/')
->cookie('admin_name', $adminInfo['username'], 3600 * 24 * 7, '/')
->cookie('login_show_code',null, time() - 3600, '/');
} else {
$response->cookie('remember_me', null, time() - 3600, '/')
->cookie('admin_name',null, time() - 3600, '/')
->cookie('login_show_code',null, time() - 3600, '/');
}

return $response;