Summary of Changes

When using a Closure with the cache's callback controller, generating the ID will fail because it attempts to serialize a Closure which isn't allowed. Change the code to use an object hash for the Closure instead.

Testing Instructions

Probably should be easily triggered just by turning on caching for core because there are a few places where Closures are used now. Failing that, I guess something like this should work as a test case:

JFactory::getCache('_system', 'callback')->get(function () { echo 'Hello World!'; });

Expected result

Page displays correctly

Actual result

Page errors out due to attempted serialization of a Closure

Documentation Changes Required

N/A