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Upgrade to PHP 8 fails

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I just upgraded my live forum from 4.5 to 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?


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  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.
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