Codeigniter: Message: Cannot modify header information - headers already sent by (output started at [duplicate]

Question

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.

@JohnConde Thank you . I will delete this question after solving this issue — Dan
– Dan, Commented Apr 12, 2013 at 15:11
lol, dont delete it, give at least one vote to Jonh Conde who helped you! — Tomás
– Tomás, Commented Apr 12, 2013 at 15:13

JackPoint · Accepted Answer · 2013-04-12 15:21:06Z

36

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.

edited Apr 12, 2013 at 15:21

answered Apr 12, 2013 at 15:11

JackPoint

4,1031 gold badge33 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

8 Comments

Tomás Over a year ago

Yep, is a whitespace. @Burls Willis check headers already sent by (output started at MY_Controller.php:1). It's pointing to line 1, and the only thing that is sending something to the frontend on the first lines in a php file are whitespaces.

Dan Over a year ago

@phpNoOb So what should i do in that line? Shall i give more space or shall give no space before php opne tag <?php

JackPoint Over a year ago

@BurlsWillis no space, remove al. Updated my original answer with an explanation.

Pratik Butani Over a year ago

yes Its a Whitespace error before <?php tag...

Robot70 Over a year ago

For my issue, I had a php cron task that hit that controller every 5 minutes to run a function. That php cron file caused the session headers already sent issue. I had to move my session_start in that controller into a function that was NOT called by the cron php task. That fixed it.

|

Collectives™ on Stack Overflow

Codeigniter: Message: Cannot modify header information - headers already sent by (output started at [duplicate]

1 Answer 1

8 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

8 Comments

Linked

Related