重定向Header（）替代[duplicate]

Question

Possible Duplicate:
Headers already sent by PHP

I have a php webpage that displays a drop down menu

The drop down menu provides links to a back-end script that will run a query and set some session variables. Then it redirects to the results page with

header('Location: search_results.php');

the redirect dies with "Cannot modify header information - headers already sent"

trying to figure out a way around this. The "Modify header" error is an error that's always local from the PHP script that's currently running? Or is it the whole session in general?

thanks, JM

Answer 1

Without looking at your code, I'll hazard a guess that you have HTML before the header PHP code. Headers need to be parsed before HTML.