Wordpress, Redirect to random post from spesific categories

<?php foreach(um_user('user_categories') as $value){ echo $value . ", "; } ?>

With this code, i echo sth like (Category 1, Category 2)

What i want to do is;

Creating a button, which will redirect user to one post from these categories, than after click the button again, will redirect another post, but will never redirect the same post again.

I also want when a user log out and log in, want these button to continue where it stopped.

Do you have any idea how i can do this?

Thanks alot