Cannot send session cache limiter - headers already sent - CodeIgniter (Session.php)

Question

I know this is discussed already many times, but I think this is different case.

I am making a simple ajax call to a php method which is as below:

public function updateAbout()
{
    log_message('debug', "updateAbout is called", false);   

     log_message('debug',$this->input->post('fname'), false);

   log_message('debug', "updateAbout success", false);   

}

In this method I am simply trying to get data which is passed by ajax call.

But I don't get data posted by ajax call instead get 2 errors:

Severity: Warning --> session_start(): Cannot send session cache limiter - headers already sent ...\..\\libraries\Session\Session.php 143
Severity: Warning --> Cannot modify header information - headers already sent ..\..\libraries\Session\Session.php 171

Note:

I am not using session_start() anywhere in my project.

This error is pointing to session_start() method which is in Session.php file of CodeIgniter libraries. It is not pointing to anywhere in my code so I am not sure where do I look for issues.

I have already checked answers all over internet and none of them seem to solve this issue.

Why am I getting this error and how can I prevent this?

Edit:

As per suggestions in other answers, I have checked and removed spaces in <?php ?> in all my codes.

Here is my JavaScript code where ajx call is made.

      $("#btnupdateAbout").click(function(){

      $fname=$("#updatefname").val();
      $lname=$("#updatelname").val();
      $country=$("#updatecountry").val();
      $locality=$("#updatelocality").val();

      if($('#optradioMale').is(':checked')) { $gender="Male"; }
      else{$gender="Female";}

       $.ajax({

           url:"http://localhost/Voyager/ProfileControls/updateAbout",
           data:{'fname':$fname,'lname':$lname,'country':$country,'locality':$locality,'gender':$gender},
           method:"POST",
           contentType:false,
           cache:false,
           processData:false,

           success:function(){

           }

       });
   });

@Tpojka you mean in view or controller?? In controller I have no closing php tag. In view, I have to else it will give error. — Dheeraj Kumar, May 19 '17 at 12:59
Right. In controller and other plain PHP files. Also check and make sure your working files are saved as UTF-8 without BOM. — Tpojka, May 19 '17 at 13:08
and why it is not point to exact location of origin in my code?? How do I find this in my project containing more than hundreds of php files. this all was working well untill I added a modal and ajax call.. now even after removing this part of code this error is coming. :( — Dheeraj Kumar, May 19 '17 at 13:13
Check [here](http://stackoverflow.com/questions/8432584/how-to-make-notepad-to-save-text-in-utf-8-without-bom). — Tpojka, May 19 '17 at 13:17
Are you using the CodeIgniter session library, default PHP session library, or neither? — Goose, May 19 '17 at 14:08
can you add the java-script (AJAX) code too in your question plz. and where do you see this error messages ? in your log files or in the browser console log ? — Nassim, May 21 '17 at 19:07
@Nassim I have added javascript code as well. I see these errors in log files. — Dheeraj Kumar, May 22 '17 at 03:01
Let us continue this discussion in chat http://chat.stackoverflow.com/rooms/144808/ci-session — Nassim, May 22 '17 at 07:11

score 2 · Answer 1 · edited May 23 '17 at 12:18

2

Could you please check this answer How to fix "Headers already sent" error in PHP

Probably, there is some output/or error thrown before the header is set.

edited May 23 '17 at 12:18

Community

1
1

answered May 19 '17 at 11:43

prab

290
1
12

I don't get it. I mean I have nowhere echo statement printing anything, no session_start code, no whitespaces. Where do I look for. Error message is pointing to session library of codeigniter. :( – Dheeraj Kumar May 19 '17 at 12:23

Nassim · Accepted Answer · 2017-05-22T08:34:35.220

1

Make use of F12 in your browser during the ajax call and and click on console and network to see your ajax call details, sometimes an error occur due to deprecated methods and you need to change some php settings in php.ini like

always_populate_raw_post_data = -1

also if you are using routes.php make sure you are using the correct path

edited May 22 '17 at 08:34

answered May 22 '17 at 06:33

Nassim

2,879
2
37
39

after few debugging we found out that issue was with url in ajax call which didnt match with actual url (Case sensitivity). Thanks a lot Nissam. – Dheeraj Kumar May 22 '17 at 08:26

score 0 · Answer 3 · answered May 21 '17 at 17:26

0

When you make the AJAX call, you are calling the Code-igniter entry point which will load all the required libraries including starting the session.

Don't know what the function log_message() is doing, but I believe that tries to print to STDOUT and then later one your code or Code Igniter tries to send some Headers.

Can you post most details about your log_message() function???

answered May 21 '17 at 17:26

Rares Harnagea

13
3

Log_message is just for the purpose of debugging. It just prints out stuff in log files. ://www.codeigniter.com/user_guide/general/errors.html – Dheeraj Kumar May 22 '17 at 02:56
If only I could find which part of my code is sending headers :( – Dheeraj Kumar May 22 '17 at 03:02

Cannot send session cache limiter - headers already sent - CodeIgniter (Session.php)

3 Answers3