How persist a simple variable for all different sessions in php?

Question

There is a very complex calculation and system health verifications that returns a numeric variable.

This variable will be displayed in every page, But I don't want to make this verification and calculation every navigation. This value should be visible to EVERY session for all users, not just one session. the most simple solution could be a global variable that would persist and be available for all sessions.

Filesytem or database are not an option.

Is that possible in PHP?

Answer 1

shared memory could be a solution.