Hi,
I'm getting an error being displayed when I want to start a session in PHP. This is it:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /www/vndv.com/d/r/e/dreday/htdocs/register.php:7) in /www/vndv.com/d/r/e/dreday/htdocs/register.php on line 31


Can someone explain to me whats going on and why its coming up. Thanks

session_start() has to be before any output to the browser, (any echo, any characters outside <?php and ?>) if there is some output prior to the function being called you get an error like that above.