A PHP Error was encountered Severity: Warning Message: Cannot modify header

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home1/grupoye1/public_html/teste/gestor/application/core/MY_Loader.php:1)

Filename: libraries/Session.php

Line Number: 687


I use xampp, as test server running on my computer.
in xampp this error does not occur!
This error only occurs on my server online, and I have no idea what might be.
someone help me?

I would hazard a guess and say that you have called session_start() in your index.php file. Try searching for session_start() in your project.

A work-around is to modify the following file:

CodeIgniter_RCS/system/libraries/Session/Session.php

PHP Code:

// John added to try and see where the session_start() was already started
   if( isset($_SESSION) ) {
    // $TMP = $this->uri->uri_string(); // PROBLEM
    $TMP = $_SERVER['REQUEST_URI'];
    log_message('error', 'Session.php ALREADY STARTED: ' .$TMP); 

   }else{    
    session_start();

   }//endif;            

   // ORIGINAL SCRIPT
     // session_start(); 


A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home1/grupoye1/public_html/teste/gestor/application/core/MY_Loader.php:1)

Filename: libraries/Session.php

Line Number: 687


I use xampp, as test server running on my computer.
in xampp this error does not occur!
This error only occurs on my server online, and I have no idea what might be.
someone help me?

You probably have error reporting turned off on your local environment and that's why you don't see the warning.

I would hazard a guess and say that you have called session_start() in your index.php file. Try searching for session_start() in your project.

A work-around is to modify the following file:

CodeIgniter_RCS/system/libraries/Session/Session.php

PHP Code:

// John added to try and see where the session_start() was already started
   if( isset($_SESSION) ) {
    // $TMP = $this->uri->uri_string(); // PROBLEM
    $TMP = $_SERVER['REQUEST_URI'];
    log_message('error', 'Session.php ALREADY STARTED: ' .$TMP); 

   }else{    
    session_start();

   }//endif;            

   // ORIGINAL SCRIPT
     // session_start(); 


DO NOT EVER suggest for a user to modify a file under system/.