9.7 Using PHP

This section gathers most common errors you can face, while writing PHP scripts.

• 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?

Sommaire :

• 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?