The configuration.php file is ok, with the driver changed to mysqli
However, the php interpreter (Fastcgi) logs this error:
2016/04/11 09:59:56 [error] 1019#0: *771793 FastCGI sent in stderr: "PHP message: PHP Fatal error: Cannot access property started with '\0' in /usr/share/nginx/html/joomla10d/libraries/vendor/joomla/registry/src/Registry.php on line 684" while reading response header from upstream, client: 188.82.186.31, server: www1.ideiao.com, request: "GET /joomla10d/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm/php-fpm.sock:", host: "www1.ideiao.com"
On line 684: the file contains: $parent->$k = new \stdClass;
The interesting thing is that if jdiction is installed (disabled or enabled), the file has plenty of \stdClass occurencies.
The file mentioned above appeared after the upgrade of Joomla from 3.3.6 to 3.5.1.
Hopefully, I made a backup of the site before...
Can you understand the problem?
Thanks.