The right way to exchange data between processes?

[Steinweber]

I would like to share data (e.g. collections) between processes, crontabs and workers. The aim is to ensure that the data are always in memory during the application's runtime and no longer needs to be queried from the database.
I have tested this with a simple class and static $data, get() and set(), which mostly works. However, I have the impression that this is not correct.