Codeigniter: Message: Cannot modify header information - headers already sent by (output started at
codeigniter, php
Solution
There seems to be whitespace before the php open tag `<?php` in MY_Controller.php.
Check all PHP files and remove the whitespace before the `<?php` tag. If there is a space or new line, the body of the http request is started, and you can't add new headers to the http request.
Problem
I have created a dynamic menu CMS website. I developed in a Windows system. When i run my project in windows operating system, My project runs without any error. But now uploaded it into Linux Operating system server i am getting warning & error like: ``` A PHP Error was encountered Severity: Warning Message: Cannot modify header information - headers already sent by (output started at /home/ansofcm8/public_html/apps/resources/math/application/core/MY_Controller.php:1) Filename: libraries/Session.php Line Number: 675 ``` What could be the reason. Please help me.