Where can I find a complete list of pre-set variables available to me, and why are these not documented in the PHP documentation?
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9.7 Using PHP
9 FAQ : Foire Aux Questions
 Manuel PHP
.  I would like to write a generic PHP script that can handle data coming from any form. How do I know which POST method variables are available?
.  I need to convert all single-quotes (') to a backslash followed by a single-quote. How can I do this with a regular expression?
.  When I do the following, the output is printed in the wrong order:
.  Hey, what happened to my newlines?
.  I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'.
.  I need to access information in the request header directly. How can I do this?
.  When I try to use authentication with IIS I get 'No Input file specified'.
.  My PHP script works on IE and Lynx, but on Netscape some of my output is missing. When I do a "View Source" I see the content in IE but not in Netscape.
.  How am I supposed to mix XML and PHP? It complains about my <?xml> tags!
.  How can I use PHP with FrontPage or some other HTML editor that insists on moving my code around?
.  Where can I find a complete list of pre-set variables available to me, and why are these not documented in the PHP documentation?
-> 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?

9.7.12 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?

Environment variables are normal global variables, so you must either declare them as global variables in your function (by using " global $DOCUMENT_ROOT; ", for example) or by using the global variable array (ie, " $GLOBALS["DOCUMENT_ROOT"] ").

Note

Since PHP 4.1.0 you can also use the superglobal array $_SERVER which is available in every function. For example, you can now use $_SERVER["DOCUMENT_ROOT"] instead of $DOCUMENT_ROOT .

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Where can I find a complete list of pre-set variables available to me, and why are these not documented in the PHP documentation? Using PHP FAQ : Foire Aux Questions