[Resolved] Warning: Cannot modify header information

wilku

Could anyone please help me.
I get this message when I try to call setcookie() or header():

Warning: Cannot modify header information - headers already sent by (output started at C:\Documents and Settings\Tomek\Moje dokumenty\WWW\PW\login.php:2) in C:\Documents and Settings\Tomek\Moje dokumenty\WWW\PW\login.php on line 37

The source goes like this:

//first line empty
<?php //line nr 2 at which,it is said, the output is starting

$nazwa = $_POST['nazwa'];
$haslo = $_POST['haslo'];

function pc_validate($user,$pass)
{
//definition of a pass validation function
}

if (!pc_validate($nazwa,$haslo))
{
	echo "ERROR!";
	exit;
}
else
{
                dokument_id = $_GET['dokument_id'];
	if ($dokument_id == "")//this doesn't happen because script doesn't exit
	{
		echo "Nie ustalono celu.";
		exit;
	}	
	$adres = "http://www.myaddress.pl/$dokument_id.php";
//two lines which causes the problem (nr 36 & 37)
	setcookie('login',$nazwa.','.md5($nazwa.'secret word'));
	header('Location: '.$adres);

}

?>

My configuration is localhost with Apache 2.0.47 on WinXP with PHP 4.3.3 as part of a server (not as CGI). All works perfectly well on a remote server with Unix.
Any ideas how to solve the problem and be able to send header information?

EDIT: added source

LordShryku

What are the first 5 or so lines? You can't have output beforehand, including <html>

wilku

That doesn't seem to be the problem because there is nothing in plain html nor echo'ed from php script before calling setcoockie(). The only ones are in the if-statements but after sending some text the script exits so if it doesn't, which is the case, that means the inside of an if-block is not executed.

laserlight

What is your "//first line empty" comment?

If in your actual script that comment is actally a blank line, then your problem lies there.
You should remove such blank lines.

nootropil

czesc,
Po nazwie katalogu w twoim poscie poznalem ze jestes (prawdopodobnie) moim rodakiem, wiec bede pisal w naszym jezyku. Sklaniam sie ku wyjasnieniu w ostatnim poscie. Przed wyslaniem naglowka nie moze byc doslownie niczego nawet pojedynczej spacji.

pozdrowienia