[PHP] Missing $GLOBALS SCRIPT_URI

I am writing some php code that requires the $GLOBALS['SCRIPT_URI'] variable. When I access the code under its encrypted (https) location it is available without issue. However, when I try to access the code under its unencrypted (http) location it is not available. In fact, phpinfo() shows

[PHP] Missing $GLOBALS SCRIPT_URI

I am writing some php code that requires the $GLOBALS['SCRIPT_URI'] variable. When I access the code under its encrypted (https) location it is available without issue. However, when I try to access the code under its unencrypted (http) location it is not available. In fact, phpinfo() shows