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According to this post: Which $_SERVER variables are safe? and another I've seen, a client seems to be able to set custom $_SERVER variables. For example: $_SERVER['HTTP_EXAMPLE']
How would a client actually set a value to $_SERVER['HTTP_EXAMPLE']?
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$_SERVER is an array containing information such as headers, paths, and script locations. The entries in this array are created by the web server. There is no guarantee that every web server will provide any of these; servers may omit some, or provide others not listed here.
$_SERVER['PHP_SELF'] Returns the filename of the currently executing script. $_SERVER['GATEWAY_INTERFACE'] Returns the version of the Common Gateway Interface (CGI) the server is using.
$_SERVER['REQUEST_URI'] contains the URI of the current page. So if the full path of a page is https://www.w3resource.com/html/html-tutorials.php, $_SERVER['REQUEST_URI'] would contain /html/html-tutorials. php.
$_SERVER['DOCUMENT_ROOT'] returns. The document root directory under which the current script is executing, as defined in the server's configuration file.
If you have access to the Apache config file, you can do it using mod_env
SetEnv HTTP_EXAMPLE http_example
Then you can access that variable
echo $_SERVER["HTTP_EXAMPLE"]; //outputs http_example
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