Pierre Lannoy

The more I see the symptoms the more I’m asking if your hosting support all APCu features…

Can you tell me what’s your hosting?

Ha yes, that would be cool to see what they do in this mu-plugin ??

Yes, I agree with you, object caching with such plugins is obviously “mandatory”… But what is strange is, as all object caching plugins show similar errors, it’s something THEY do in their plugin.

Never minds, I will try to contact them to understand what’s the culprit. By any chance, do you have the mu-plugin they propose to fix these errors?

Hello @hellodracon !

That’s a first for me (the fact that a plugin have the ability to not be “compatible” with WordPress native features)… Do you have some resources (articles, docs, etc.) about this “incompatibility”?

the object-cache.php file that was in wp-content/mu-plugins

Ok, it explains all symptoms. This is strictly “forbidden” to have something that is not a mu-plugin inside this directory, because it is auto-loaded…

Very happy you find the root-cause. ??

To be honest, I don’t think it’s *your* fault. The fact that activating the plugin cause the specified issue indicates that something else (may be: theme, plugin, mu-plugin or personal development) is “preempting” WordPress to correctly use cache. And it do it by forcing the load of the WP_Object_Cache class before it must be.

Have you noticed that this issue has occurred after you installed a new plugin, writen some lines of code, changed your theme, etc. ?

Yes, it should. And you can’t just restore it from a backup as this file is actually “controlled” by WordPress itself.

Has APCu Manager worked before on this site or has it never worked properly?

This is not “normal” at all: this file is created by APCu Manager and without it, nothing can work…

This may reveal a wider problem affecting your entire site… Has APCu Manager worked before on this site or has it never worked properly?

Yes, I think it would be interesting to remove the wp-content\plugins\apcu-manager folder AND the wp-content\object-cache.php file to see what going on.
Then, if there’s no error, no “strange” things, reinstall APCu Manager…

• This reply was modified 1 month, 3 weeks ago by Pierre Lannoy.

Hello @hellodracon !

Sorry to hear that…

You’re definitely right: it can come from another object cache plugin which is called directly and before WordPress load the object-cache.php file. To be honest, I have no idea how such a case could arise.

Do you have other issues with your site that can be linked (or not)?

OK. So, I confirm: APCu Manager doesn’t write file on the server.

Hello @wieselweb !

APCu Manager doesn’t write a single file…
Of course, I could be wrong, but the chances of your files problem coming from APCu Manager are close to 0.

BTW, what do you call “the web space”?

It’s very good news, actually… ??

I close this ticket. Just answer to it if you need to re-open it. Have a nice day.

Hello @demironmanx !

Many thanks for this report. Although I’ve never seen this behavior, I’m going to try to reproduce it. Could you please copy here the health report for the site? It will help to see if there’s something obvious and, if not, to reproduce your environment from my side.

Thanks.

Hi @wpapm

Yes, version 4.x of the plugin works with WP 6.6