How do I run a php script from /root instead of forum/root without errors?

[Fibe]

Example I moved this random hack to the website root instead of the domain root and get this error:

Warning: main(./global.php): failed to open stream: No such file or directory in /home/xxx/public_html/members.php on line 81

Fatal error: main(): Failed opening required './global.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/xxx/public_html/members.php on line 81

I fixed this by simply changing:

// ######################### REQUIRE BACK-END ############################

require_once('./global.php');

To:

// ######################### REQUIRE BACK-END ############################

require_once('./forums/global.php');

But now I get the following error where I no longer have any clue how to make it work:

Warning: main(./includes/init.php): failed to open stream: No such file or directory in /home/xxx/public_html/forums/global.php on line 53

Fatal error: main(): Failed opening required './includes/init.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/xxx/public_html/forums/global.php on line 53

Anyone able to assist me with this problem?

Thanks !