Create a Global Session for all users

By default session data is serialized and saved to a temporary file associated with the user's session, which is tracked by a cookie. You can configure session data to be saved in the database as well. This data is available via the $_SESSION superglobal per user.

So if you follow that logic, then either store serialized data in a file or store it in the database and to access it, it won't be a superglobal, but something almost a superglobal if you read it in as a global array such as $GLOBALS['all_peeps'].

You can do the same with an object or static class. It's really the same as config variables that you would use for your application regardless of the user.