Question

I noticed when I did a var_dump on the $_SERVER superglobal there were some values that were not included in the php manual here: http://www.php.net/manual/en/reserved.variables.server.php For example that page doesn’t talk about the HTTP_X_FORWARDED_FOR. In my dump I also had variables like PATH, PATHEXT, etc.

Am I on the wrong page, where can I read about ALL of the $_SERVER variables? Thanks.

Answer 1

Regarding $_SERVER

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. That said, a large number of
these variables are accounted for in
the CGI/1.1 specification, so you
should be able to expect those.

Details about CGI/1.1 (where these variables should be accounted for as mentioned in the quote) are here. This does not take into account (as mentioned in another answer) OS variables like PATH, and so forth.