I'm trying to access one of the standard CGI variables (such as $DOCUMENT_ROOT or $HTTP_REFERER) in a user-defined function, and it can't seem to find it. What's wrong?

It's important to realize that the PHP directive register_globals also affects server and environment variables. When register_globals = off (the default is off since PHP 4.2.0), $DOCUMENT_ROOT will not exist. Instead, use $_SERVER'DOCUMENT_ROOT' .

If register_globals = on then the variables $DOCUMENT_ROOT and $GLOBALS'DOCUMENT_ROOT' will also exist. If you're sure register_globals = on and wonder why $DOCUMENT_ROOT isn't available inside functions, it's because these are like any other variables and would require global $DOCUMENT_ROOT inside the function. See also the manual page on variable scope.

It's preferred to code with register_globals = off. Note: Superglobals: availability note Superglobal arrays such as $_GET, $_POST, and $_SERVER, etc. are available as of PHP 4.1.0. More.

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