Using headers

[markyoung1984]

A page loads with several form buttons on it. Here is my code when I click on one of them:

if ($_POST['editItem'])
{
	$_SESSION['stockNum'] = $input;
	header('Location: createEdit.php',false);
	exit;
	//location
}

This seems to make sense to me but then I get the following error message in the browser, can someone please clarify this for me? What does it mean by headers already sent? Can't I forcefully replace them or something? This is urgent as I'm being pressured by my boss. Please help.

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\xampp\htdocs\viewstock.html:16) in C:\Program Files\xampp\xampp\htdocs\controller.php on line 36

[Installer]

Somewhere earlier in your script html is being output (try looking at line 16; that number wasn't pulled out of a hat). As soon as that happens the headers are sent.

Search these forums for "headers already sent" (you'll likely get scores of hits), and read the manual page for header();

[js_thind]

A quickfix:

add ob_start() at the top of the page

[bradgrafelman]

While using output buffering is a "quick fix" (SOMETIMES), it's better to understand the logical flow of a script and alter it so that you can do validation and redirects before anything is outputted.