Error: Headers already sent?

[Gero_Master]

Hello!

I had this problem when I was making a language changing script for my site.

I have 1 PHP document and another included to it in the beginning of the page.

This is all referring to headers in the included page:
session_start();
header("Cache-control: private");

On the main page I tried to set cookie:
setcookie("use_lang", $_GET['newlang']);

It gives me this error:

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\WebTicks\profile.php:15) in C:\Program Files\xampp\htdocs\WebTicks\profile.php on line 102

[Mohamed]

I am not that good in php but I think you should set cookie before calling the header. like this way.

session_start();
setcookie("use_lang", $_GET['newlang']);
header("Cache-control: private");

[siMKin]

because the cookie has to be sent with the header, you have to set the cookie before you generate any output.

[dreamcatcher]

You can also use Output Buffering to get around this issue.

[uk.php.net...]

dc

[Gero_Master]

Thank you all, I managed to fix the bug