'PHP 7.4 to 8.0 - Errors (Trying to access array offset)

We just updated to PHP 8.0 from 7.4 and are getting a bunch of errors that I'm working through.

One of the errors is actually 2 errors that looks like this:

Warning: Undefined variable $HTTP_SERVER_VARS in /home/mxst1k/public_html/includes/functions.inc.php on line 123

Warning: Trying to access array offset on value of type null in /home/mxst1k/public_html/includes/functions.inc.php on line 123

In this case, line 123 is the second row in the snippet of code below:

if (!isset($HTTP_SERVER_VARS['REQUEST_URI'])) {
    $HTTP_SERVER_VARS['REQUEST_URI'] = $HTTP_SERVER_VARS["PHP_SELF"];
    if (isset($HTTP_SERVER_VARS['QUERY_STRING']) && $HTTP_SERVER_VARS['QUERY_STRING']!='') {
        $HTTP_SERVER_VARS['REQUEST_URI'] .= '?' . $HTTP_SERVER_VARS['QUERY_STRING'];
    }
}

I've been trial and error fixing some of the other warnings and errors, but this is from a functions include file and I don't want to mess it up! I believe I may need to do something with Isset here, but it's a little fuzzy for me.

Any insight on the fix here would be greatly appreciated.

Thanks

phperror-handlingisset


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