PHP: How to get a random value between 2 users ID

I have selected two users with their id.

eg:

$user_one = 1034;
$user_two = 1098;
$new_id = "";

Now I want to select one user between these two users randomly. Can someone please help me how to select random ids from given ids.

eg:

$new_id = $get_random_id  //Must be 1034 or 1098