* bantu/ticket/10875:
[ticket/10875] tests/cache/cache_test.php: Use single quotes where possible.
[ticket/10875] Test for null cache driver and sql cache.
[ticket/10875] Revise sql cache test.
[ticket/10875] Must return query result on failure.
[ticket/10875] More documentation.
[ticket/10875] Spelling fix.
[ticket/10875] Add docblocks for phpbb_cache_driver_interface
[ticket/10875] Add comment about cache's sql_load() method.
[ticket/10875] Fix logic in phpbb_cache_driver_file::sql_save().
[ticket/10875] Fix phpbb_mock_cache::sql_save() to return $query_result.
[ticket/10875] Fix return value of phpbb_cache_driver_null::sql_save().
[ticket/10875] Remove useless assignment from phpbb_cache_driver_memory.
This reverts commit 303fc646adf9104d7c82cf8bcebbc8fc0d328624, reversing
changes made to 9c28470ad7b45c10ce3a32065650e4b17f9f27ea.
The correct fix should be to alter the container file name to start with
container_ prefix.
PHPBB3-11199
Previously (develop-olympus) $query_result was passed via reference into
sql_save(). Now the (possibly changed) result is returned by value.
Adjust logic to take this change into account correctly.
PHPBB3-10875
The sql_save function cannot take arguments by reference since it is called
by call_user_func_array()
Replace use of isset($cache->sql_rowset[$query_id]) with $cache->sql_exists
Replace $cache->cache_dir with $cache->get_driver()->cache_dir
PHPBB3-10875
They are now refered to as cache drivers rather than ACM classes. The
additional utility functions from the original cache class have been
moved to the cache_service. The class loader is now instantiated without
a cache instance and passed one as soon as it is constructed to allow
autoloading the cache classes.
PHPBB3-9983
