Nope, you can use header() after starting a session.
This works fine, even if a session is already started:
session_start();
header("Location: http://www.fbi.gov");
Creapy, but it works.
You see, when a "header" is sent, it's not actually "sent". PHP collects all
headers and fills out a header table, which it sends to the webserver once
the script ends or when the first piece of data is sent to the browser
(whichever comes first).
That's why you can make 10 calls to header and all of them will work.
If you are getting the "headers already sent error" it's most likely because
you unknowingly sent data to the user's browser. But you'd get one of those
"headers already sent" messages. Are you getting one of those?
Note: People can append a PHPSESSID onto the end of your url to make you
think a session is already started. Also when you destroy a session, the
browser still likes to send the session ID to you. So checking for only the
existance of PHPSESSID to see if the user has logged in or at least tried to
is a bad idea. You should probably check for the existance of a variable
inside that session. To see if they've attempted to login (even if you do
that anyway, it's a good idea not to bother with something like if
(!$PHPSESSID)).
--
Plutarck
Should be working on something...
...but forgot what it was.
"Scott" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Does anyone know of a way to use sessions and still be able to redirect
with
> the header function. In the code below I test for the existence of the
> PHPSESSID and send the user to register if it doesn't exist. If it does
> exist I start a session to retrieve the session variables then call a
class
> that tests for other conditions. If the test is successful then I try to
> redirect which fails because (as I understand it) session_start has
already
> sent headers.
> I really don't like putting links on pages that say "Click here to
continue"
> so I'm looking for a solution. Any ideas?
>
> <?
> if (!isset($PHPSESSID)){
> header("Location:http://www.blah.com/register.php");
> }
> session_start();
> if ($action == "update"){
> include("../includes/update_class.php");
> $my=new update_listing();
> header("Location:http://www.blah.com mem_welcome.php?sid=$PHPSESSID");
> }
> ?>
>
> JS Plauche
>
>
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