Just for curiosity. All superglobals (for example $_POST, $_GET, $_FILES, $_SESSION) have an underscore and only the $GLOBALS superglobal does not. Why is that so? What does the underscore mean in superglobal variables in PHP and generaly in PHP? Thanks in advance.
I saw a note on PHP manual page that says
Note: Variable availability Unlike all of the other superglobals, $GLOBALS has essentially always been available in PHP.
May be that's why they want to keep it like this, but this is just a guess.