[apcu_cache_info](<http://php.net/manual/en/function.apcu-cache-info.php>) provides information about the store and its entries:

print_r(apcu_cache_info());

Note that invoking apcu_cache_info() without limit will return the complete data currently stored.

To only get the meta data, use apcu_cache_info(true).

To get information about certain cache entries better use APCUIterator.