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So far (end of chapter 1, just before jumping into the OO part) the book doesn't say a word about superglobals. I think this is an important topic and I suppose there must be questions about the superglobals on the exam.

The best place to get an idea about the superglobals is this PHP.net manual entry.
Note how there was a different set of superglobals prior to php.4.1 but I was lead to believe that the exam is concentrated on stuff after 4.1. (and before php5).

Briefly, here's the list of superglobals:

• $_GET - variables sent using a GET HTTP request
• $_POST - variables sent using a POST HTTP request
• $_COOKIE - array of all cookies that are sent by the server
• $_REQUEST - a merge of the three above
• $_SESSION - array containing the session data
• $_SERVER - server variables like REMOTE_ADDR, SCRIPT_NAME, REQUEST_URI, etc.
• $_ENV - more or less the same as $_SERVER
• $_FILE - data about uploaded files
• $GLOBALS - array of all global variables, see the previous blog entry for an example

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