Upgrade to PHP 8 fails

[Genestoy]

I just upgraded my live forum from 4.5 to 4.7.2.1 and all went well during the upgrade, then I enabled and updated all Marketplace Apps & Plugins and all went well.

This was all done with PHP 7.4 and MariaDB 10.3.35-MariaDB-cll-lve

Then I switched to PHP 8 and forum went blank white page

Switched back to PHP 7.4 and disabled all Apps (2) and plugins and modified default theme switched to IPS default theme

Switched to PHP 8 and same thing all blank website

What next to go to PHP 8?

Thanks

[Jim M]

1. Check to ensure your PHP 8 has all required extensions/modules: https://invisioncommunity.com/files/file/7046-invision-community-requirements-checker/
2. Check to ensure your third party applications/plugins are compatible with PHP 8.
3. All else fails, check the server error log entries and see what is happening to cause a suppressed PHP error.

[Genestoy]

Did the IPS4 checker before but here it is again

Some plugins are "custom" and have not been updated for a while, but if they are disabled would they still cause the problem?

 

Edited September 19, 2022 by Genestoy

[Marc]

You are running the checker while you are using PHP 7.4 there. You need to run the checker after you have switched to php 8.

 

With regards the custom items, while they shouldnt, the only people who can answer that fully are the authors

[Genestoy]

OK - here is the one with PHP 8 enabled, where and how do I fix this?

Thanks

 

[Jim M]

As mentioned in the error there, please contact your hosting provider or server administrator as mentioned to install MySQLi PHP extension.

[Genestoy]

Thanks a bunch Jim,

I added the missing modules to PHP 8 in cPanel and found the culprit was the "Online Indicator" old plugin and all seems well now!

 

[Jim M]

Glad to hear you have things running now.