session_start() errors

[coolboarderguy]

Hi All,

this code, at the top of my page

<?php
session_start();
if (!$_SESSION['customer_id']) {
header("Location: login.php");
}
?>

produces these errors,

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /var/www/html/search.php:4) in /var/www/html/search.php on line 5

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /var/www/html/search.php:4) in /var/www/html/search.php on line 5

Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/search.php:4) in /var/www/html/search.php on line 7

[thorpe]

make sure there is nothing being sent to the client first. this means white space, and ANY html.

[chris_davies]

as the message above says, make sure there is NOTHING in your script before the session_start() call, also, are you using windows? if you are, you're gonna have to use a windows fix, have a look at the following code, this goes at the very top of one of my pages, no gaps, no white space, no HTML, not even one space before the <?php.........

<?php
session_start();
header("Cache-control: private");// IE 6 fix
$session['adminusername'] = $POST['adminusername'];
$session['Password'] = $POST['Password'];
if((!isset($session['adminusername']) ||(!$session['Password']))){
header("Location: accessdenied.php");
exit;
}?>

notice the header("Cache-control: private");

this is a fix for windows and is internet explorer specific.

hope this helps you 😮)