Facebook PHP SDK Logging Out on Page Change

Question

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /kunden/406064_81373/webseiten/lightningsoul new/db/lg_db_login.php:25) in /kunden/406064_81373/webseiten/lightningsoul new/fb/facebook.php on line 49

I get this error when using the fb SDK.

Here are lines 23-28 of the referred lg_db_login.php:

$thisadress = $_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
$thisurl = $thisadress;
$dateiurl = explode('/',$url);
$datei = explode('.',$dateiurl[1]);
$shareurl = explode('&PHPSESSID',$thisadress);
$shareurl2 = $shareurl[0];

I don't really get the error at all and I don't know why the login works and whenever I click on a link it logs a user out (or the login is not being recognized any more)... Check this page to reproduce the error.

Here are lines 47 to 55 of the facebook.php (original, I changed nothing in that):

  public function __construct($config) {
    if (!session_id()) {
      session_start();
    }
    parent::__construct($config);
    if (!empty($config['sharedSession'])) {
      $this->initSharedSession();
    }
  }

Answer 1

issue is about session_start(); function you should write it add first line after <?php

<?php
session_start();