PHP Fatal error: Uncaught Error: Undefined constant “WP_CACHE_KEY_SALT” | ww.wp.xz.cn

Resolved Jamie Burchell
(@jamieburchell)

1 year, 5 months ago
Hi

In version 2.8.2 I am unable to clear the caches without triggering a fatal PHP error:
```
PHP Fatal error: Uncaught Error: Undefined constant "WP_CACHE_KEY_SALT"
```
I noticed in master.php I had this:
```
"objectcache.debug": false,
"objectcache.debug_purge": true,
```
I guess debug_purge is enabled even though debug is disabled? Either way, what is the expected behaviour here? Should WP_CACHE_KEY_SALT be defined? I have these constants defined:
```
AUTH_KEY
SECURE_AUTH_KEY
LOGGED_IN_KEY
NONCE_KEY
AUTH_SALT
SECURE_AUTH_SALT
LOGGED_IN_SALT
NONCE_SALT
```

Viewing 5 replies - 1 through 5 (of 5 total)

Plugin Contributor Marko Vasiljevic
(@vmarko)

1 year, 5 months ago

Hello @jamieburchell

Thank you for reaching out and I am happy to help!
Can you please check if you have define( ‘WP_CACHE_KEY_SALT’, ‘domain.com’ ); in wp-config.php and if not can you please add this and let me know if the issue persists?

Thank you and sorry for any inconvenience.

Thanks!

Thread Starter Jamie Burchell
(@jamieburchell)

1 year, 5 months ago

Hi @vmarko I do not have that constant defined anywhere. I guess my question really is why does the lack of this constant now cause a fatal error in the latest version of W3TC.

Plugin Contributor Marko Vasiljevic
(@vmarko)

1 year, 5 months ago

Hello @jamieburchell

Thank you for your feedback.
Yes, we are aware of this. To resolve it now, just create a definition in wp-config.php for “WP_CACHE_KEY_SALT” set to a random string. The fix is on the way and you can check it n our GH Repo
Thanks!

Thread Starter Jamie Burchell
(@jamieburchell)

1 year, 5 months ago

Thanks for the update @vmarko 🙂

Plugin Contributor Marko Vasiljevic
(@vmarko)

1 year, 4 months ago

Hello @jamieburchell

You are most welcome!

Thanks!

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘PHP Fatal error: Uncaught Error: Undefined constant “WP_CACHE_KEY_SALT”’ is closed to new replies.

5 replies
2 participants
Last reply from: Marko Vasiljevic
Last activity: 1 year, 4 months ago
Status: resolved