[RESOLVED] Help with function error

[lelyea]

My code is generating a warning and I can't figure it out . . .

Warning: Cannot modify header information - headers already sent by (output started at C:\Inetpub\wwwroot|PortalApps\functions.php:10) in C:\Inetpub\wwwroot\PortalApps\functions.php on line 294

Line 294:
setcookie("cookieId", session_id(), time() + ((3600 24) 30));

Code in page calling function (at the very top of script):

<?php
session_start();
require_once ('functions.php'); // file which has GetCookieId()
$session_id = GetCookieId();
echo $session_id;
?>

FUNCTION:
<?php
function GetCookieId()
{
if(isset($COOKIE["cookieId"]))
{
return $COOKIE["cookieId"];
}
else
{
session_start();
setcookie("cookieId", session_id(), time() + ((3600 24) 30));
return session_id();
}
}

?>

Any help greatly appreciated!!

[laserlight]

Please post PHP code in [php][/php] bbcode tags.

The problem is that you print to the browser before the setcookie() call. Output cannot be sent to the browser before headers, including the one for cookie, are sent. You need to restructure your code such that you set the cookie before printing any output (including blank lines). (Output buffering can be used as a workaround, but it would be more of a hack than a proper solution in this case.)

[NogDog]

output started at C:\Inetpub\wwwroot|PortalApps\functions.php:10

That tells you where output was generated, so you could start by seeing what goes on around line 10 in that file. (Remember that anything - including spaces/newlines - not within <?php...?> tags will generate output.)