header() problem - cannot modify

scriderpsd

Hey guys, I'm working up some form validation and am getting this error that I can't diagnose. Here's what I am trying to do in trans.php...

if (!empty($six_digit)) {
	header("location: form_success.php");
}

But here is the error I am getting...

Warning: Cannot modify header information - headers already sent by (output started at /srv/www/htdocs/web_test/login.php:4) in /srv/www/htdocs/web_test/trans.php on line 28

I include my login.php file at the trans.php file...

include($DOCUMENT_ROOT .'/web_test/login.php');

I'm not exactly sure what my problem here is. I'm essentially trying to redirect (once validation has taken place) to form_succes.php

Thanks in advance. Any and all help is much appreciated.

Scott

altexis

This must be a problem with session_start();
You have to put that command prior to any other output in your script.

ClarkF1

if you have any information outputted to browser, header() won't work

Does login.php output anything to the browser such as a login form.

scriderpsd

login.php is just a login script. It only outputs the first time through. Once a valid login is presented, it just sets the session variables.

altexis

Make a test.. halt the script before the command that produces the problem and open the HTML source from your browser to see if there is any output..

if (!empty($six_digit)) {
	echo '-';
	die();
	//header("location: form_success.php");
}

The echo '-'; helps in case the output is just a space.

Weedpacket

What does line 4 of login.php do?