Cannot modify header information

[hello123456789]

hi, I have recently been trying to debug a script and it has come up with a number of error messages, the most important (which I think is the culprit) is

 

Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/web2/discussion.php:7) in /Applications/MAMP/htdocs/web2/discussion.php on line 14

 

heres the part of the script that the error is in:

 

<?php
require("config.php");
session_start();
if($_POST['submit'])
{
	$number_of_letters = strcspn($_POST['body'], "");
	$author_letters = strcspn($_POST['author'], "");
	if($number_of_letters == 0)
	{
		header("Location: ".$config_basedir."/discussion.php?id=".$_GET['id']."&error=1");
	}
	else if($author_letters == 0)
	{
		header("Location: ".$config_basedir."/discussion.php?id=".$_GET['id']."&error=2");
	}
	else
	{
		$submit_sql = "INSERT INTO posts(topic_id, author, body, dateposted) VALUES(".$_GET['id'].", '".$_SESSION['USERNAME']."', '".$_POST['body']."', NOW());";
		mysql_query($submit_sql) or die(mysql_error());
		header("Location: ".$config_basedir."/discussion.php?id=".$_GET['id']);
	}
}

 

I've been puzzled as to what's wrong with the code. Any help would be greatly appreciated.

 

[aniesh82]

 

Hi

 

Try to add a php function 'ob_start()' at the top of your page like

 

<?php
ob_start();
require("config.php");
// add other code here....

?>

 

Thank You,

An. Joseph

[.josh]

ob_start() may work but it's more of a bandaid than a fix and used for that is not really good coding practice.  Make sure there is no output before your session_start() not even lines or whitespace.  Check your config.php as well.  Check the top and bottom of config.php since it's being required the ending whitespace/lines would be thrown in before your session_start().