Warning: Cannot modify header information??

[corruption]

Warning: Cannot modify header information - headers already sent by (output started at /home/nukeu3/public_html/streetz-of-chaos/mysql.php:4) in /home/nukeu3/public_html/streetz-of-chaos/authenticate.php on line 24

 

can anybody tell me what this error means and how i can fix it? :?

[email protected]

[Decepti0n]

Re: Warning: Cannot modify header information??

can't use header(), or setcookie() or any of the header tags before you output html. whats on line 24?

[corruption]

Re: Warning: Cannot modify header information??

here is the ending of the code

die("<h3>Error</h3>
Invalid username or password!

<a href=login.php>> Back</a>");
}
else
{
$_SESSION['loggedin']=1;
$mem=mysql_fetch_array($uq);
$_SESSION['userid']=$mem['userid'];
header("Location: loggedin.php");
}

?>

 

line 24 is

header("Location: loggedin.php");

i dont understand why all of a sudden this error pops up? iv never changed anything in the authenticate.php

[rastus]

Re: Warning: Cannot modify header information??

I've sometimes had a error like that pop up after making a change, and not nessacarily to the page reported in the error. If you made any changes before this error poped up, undo the change and see if the error still occurs.

[Revolution]

Re: Warning: Cannot modify header information??

Most of the pages contain data from other files, and changing one of these can change most (if not all of) the other pages.

As said above, you've probably changed something linked (included) into that file

[seanybob]

Re: Warning: Cannot modify header information??

since this is kinda on the subject... whats the difference between using

header("Location: loggedin.php");

and

<meta refresh content="0; loggedin.php">

???

[Decepti0n]

Re: Warning: Cannot modify header information??

some plugins/proxies can block it, i can block meta redirection with my firefox toolbar

also, it stops loading at the header tag, so none of the page is loaded. if you put the meta thing in, it'll load all up until it, then re-direct. also even with 0 as the value its kinda slow :s

[seanybob]

Re: Warning: Cannot modify header information??

ooo, okies thx :)

[corruption]

Re: Warning: Cannot modify header information??

ok yesterday i reinstalled all the pages and it worked ok untill just a few minutes ago, im not sure exactly what the last thing i changed was besides the login page but i went back to the login page and i still got the same error lol

is there any other pages or anything that connects or uses the login page that might have been effected?