title: show recently viewed products for non-logged in users wordpress
body: <p>I'm showing recently viewed products for logged in users with below code, of course before this I'm updating user meta in wp_footer action:</p>
  
  <pre><code>$rv = get_user_meta(get_current_user_id(), 'recently_viewed', true);
  </code></pre>
  
  <p>But I need to show recently viewed products even when user is not logged in. Is there any way to do it with get_option()/update_option() or in some other way?</p>