I have problem for installation OpenCart in cPanel with Softacolous, when I\'m finished for install and during open the site I have message:
Fatal error: Class \
I recently faced the same issue, that Class mysqli not found. And found out that this particular issue is not related to OpenCart. It is related to the PHP version that your OpenCart is using and the PHP version that your server is supporting.
So make sure sure PHP version mentioned during configuration is matched with PHP version that your server is running.
In my case my server was running PHP 7.4 and OpenCart was configured for PHP 7.3. So the problem was solved by changing my server's PHP version to 7.3.
And lived Happily forever after....