Hoofdstuk 50. Using PHP

1. 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?
2. I need to convert all single-quotes (') to a backslash followed by a single-quote. How can I do this with a regular expression?
3. When I do the following, the output is printed in the wrong order:



what's going on?
4. Hey, what happened to my newlines?



5. I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'.
6. I need to access information in the request header directly. How can I do this?
7. When I try to use authentication with IIS I get 'No Input file specified'.
8. 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.
9. How am I supposed to mix XML and PHP? It complains about my ?xml tags!
10. How can I use PHP with FrontPage or some other HTML editor that insists on moving my code around?
11. Where can I find a complete list of pre-set variables available to me, and why are these not documented in the PHP documentation?
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?