codeigniter i get header already sent

i got this error

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/rapcomdk/public_html/system/language/danish/imglib_lang.php:1) Filename: helpers/url_helper.php Line Number: 541

i dont know what the problem is

here is my controller:

http://pastebin.com/EMtcMgsB

and here is my model file:

http://pastebin.com/iH6xQFGA

hope some one can help me out

Check and make sure in system/language/danish/imglib_lang.php that you have no whitespace before the <?php tag and make sure you do not have a closing ?> php tag in the file.

In addition to jondavidjohn's answer, if you're using Unicode encoding for the files, make sure there's not a byte order mark starting off the file. On some platforms, this can wreak havoc on PHP processing.

Make sure there are no errors in codeigniter, sometimes the errors can be covered by other errors, such as one error lead to another.

The problem is in system/language/danish/imglib_lang.php, which must have some character before the <?php part by the time it is parsed on the server. What's happening is that helpers\url_helper.php is trying to redirect (using this code;)

case 'refresh'  : header("Refresh:0;url=".$uri);

But is failing because imglib_lang.php, line 1 has already sent some non-header text to the response. Since headers come first, it's giving you the warning.

I wonder at it working locally but not on the deployment server. It may be that the file is not being transferred cleanly, or that the servers use different versions of PHP with different handlings of character sets.

Several checks;

1. Be absolutely sure there is no BOM at the front of system/language/danish/imglib_lang.php. Let us know why you are certain. If you've edited the file in Notepad on windows, for instance, it'll have gained the Byte Order Mark. It can be very hard to tell since some tools 'swallow' the mark. Also make sure there's no plain whitespace.
2. When you save imglib_lang.php, make sure you save it in ASCII.
3. Compare local and remote versions of PHP. If there are differences, update your local copy to the same as the servers, and retest.
4. Check that the file is being transferred perfectly. If you are putting the file up using FTP, then FTP may be modifying it as it transfers it. FTP has two modes - an ASCII mode and a BINARY mode. If the files are being transferred as ASCII, then there may be some rewriting of the file going on. Try making sure imglib_lang.php is being transferred as BINARY to make sure the exact file is being uploaded.

If you think that you have everything configured correctly, maybe your library (or specifically, imglib_lang.php) is simply producing PHP warnings or notices. If you can get a hold of your logs from your host, it would be helpful.

Otherwise, you can try to turn off PHP's error reporting:

error_reporting(0);

(you can place that line in your index.php)