[8.1] Install PHP Compat

[Rushaway]

What are the steps to reproduce this issue?

1. Use PHP 8.1
2. Try to use the installer
3. Page 3, 5 ,6 return deprecated errors

What happens?

What were you expecting to happen?

Compat with 8.1

Any logs, error output, etc.?

Page 3 : https://gist.github.com/Rushaway/4c39c7a689fd86e96b5d630efb7f286b Page 5 : https://gist.github.com/Rushaway/975e2c0f152c2c527b70e880749cfc21 Page 6: https://gist.github.com/Rushaway/f5bdfc60394c1aae1478f6fa90e6edcf

Any other comments?

What versions of software are you using?

Operating System: nginx SourceBans++ Version: 1.7.0 (php 8.1 branch) with the lastest release. PHP Version: 8.1.10 MySQL Version: 10.6.7-MariaDB-2ubuntu1 - Ubuntu 22.04 Link to your project: https://upgradebans.nide.gg/index.php Link to a phpinfo() output: https://upgradebans.nide.gg/phpinfo.php