Hello,
This is a reply to an e-mail that you wrote on Sun, 10 Aug 2003 at
00:24, lines prefixed by '>' were originally written by you.
> This may be a stupid question, but I'm trying to set up a system
where
> I can
> take a poll from visitors to my website and then set a cookie so
that
> they
> can't vote more than once (until they clear their cookies at
least).
> Problem is, I don't want to put it at the top of my page, because
what
> somebody opens up a poll but decides not to vote, then later
changes
> his
> mind. The cookie will prevent him from voting. I want the cookie
to
> be set
> right after the user clicks the vote button, but every time I do
that,
> I get
> an error about headers already being sent. Is there any way
around
> this?
You cannot send any headers after you have sent output as this is how
HTTP works, a set of headers are sent, double newline, then all the
content. You can't go back in time and add more headers.
There are two ways round your problem...
1. Set your cookie right at the top of the script, so as your first
line have something like:
if(isset($_POST['vote'])){ setcookie(....); }
2. Use output buffering, this will make PHP buffer all of your
content and not send it till you tell it to (or until it reaches the
end of the file).
Read more at:
http://uk.php.net/ref.outcontrol
All the best,
David.
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