The best way to store variable across different widgets

Question

The front page of my site building with set of widgets. Each widget shows the rows with posts for some criteria.

I want to exclude duplicate posts across different widgets. The simplest way comes to mind is to use global variable.

For example:

global $exclude;

$query = new WP_Query([
  'posts_per_page' => publish, 
  'post__not_in' => $exclude
]);

$exclude = wp_list_pluck( $query->posts, 'ID' );

I want to find better way to do this job. I've thought about wp_get_cache, but it seems that it is not what I want.

Answer 1

Unfortunately no one answers my question so I will show my way to solve this problem.

I use public query vars with get_query_var and set_query_var functions to set widget__exclude variable across all queries.

Still not sure that it is the best way for this case but hope it helps somebody.