diffiniate empty cache entry and non-existing cache entry

[onlinebizsoft]

Cm_Cache_Backend_Redis/Cm/Cache/Backend/Redis.php

Line 513 in 3fc3e91

if ($data === null || $data === false || is_object($data)) {

Look like if we save a cache entry with empty content then when we load, it is treated as non-existing cache entry so this makes some wrong logic in application usages. It would be considered as a bug or we can't do anything in this case? @colinmollenhour

[colinmollenhour]

So if you save an empty string you get false? Seems that could be an issue with save then rather than load?

[onlinebizsoft]

@colinmollenhour no, saving return true as expected. It should be an issue with load

[colinmollenhour]

I did not state my question well.. I meant, if you save an empty string and then load that key, you get false?

Please provide steps to produce, expected result and actual result for clarity.

[onlinebizsoft]

Yes, exactly, this is used and tested in a context of Magento 2 project.

[colinmollenhour]

My system is messed up at the moment.. as a workaround you could use the test() method to check for existence of a key regardless of if it was empty or not.

[onlinebizsoft]

Thanks, currently I can avoid using empty block or empty cache on the project. I just wanted to report the bug because in some cases, it can cause performance or other issues.