Godaddy linux server session start - php

I used godadday linux server for hosting. I write only <?php session_start();?> on my index.php... I also read so many reviews. I tried but there is no solution. I also take support by godaddy supporters. They said that it is coding problem. But I don't use extra code on my page. I don't understand what is going on there.
session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/26/11511826/html/test/index.php:1) in /home/content/26/11511826/html/test/index.php on line 1

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WAMP server and live server act differently - Warning: session_start(): Cannot send session cache limiter

I have a project which calls lots of AJAX PHP pages which have session_start(); called. It works fine in a WAMP server (localhost) but when I host this project on a live server it shows:
Warning: session_start(): Cannot send session cache limiter - headers already sent message
This warning error is removable when I remove session_start(); in AJAX PHP pages
and program works fine in live server but not in WAMP server (localhost) program fails.
Is there something that I have to configure in the WAMP server which works exactly like live server?
Typically, you need to have session_start(); only in the first PHP file you're loading - consequent loads of PHP pages will use the same session.
session_start(); creates a new session which will be used wherever $_SESSION variables are accessed, even in other PHP pages in the same context.
Please refer the documentation for session_start()

Implementing PHP/Mysql Login System to Wordpress Site

My friend has a wordpress site and wants me to add my premade PHP/Mysql login system. Currently i'm trying to insert PHP pages into the wordpress templates using this plugin: http://www.willmaster.com/software/WPplugins/.
The plugin lets me add php code to the page using this syntax:
[insert_php]
include "account/login.php";
[/insert_php]
However, doing this creates an issues with sessions as the page header is already sent by the wordpress page before the php file is included. I'm getting the following error:
Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at ...)
Warning: Cannot modify header information – headers already sent by (output started at...
Any ideas how to fix this?
You can write the code for your login at the top in the theme's header.php or simply don't have session_start() in login.php. Or use session_status() to check if the session has started.
You cant start a session after the head becuse data allready started to send to browser. You need to include your code in the head before any code

listing files in use or methods etc being called

I'm getting this error all of a sudden - obviously I've changed something but I can't figure out what. I've checked all files for any whitespace before/after the <?php ?> tags but they're all fine.
Warning (2): session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/dev/public_html/app/Controller/PostsController.php:1) [APP/Controller/AppController.php, line 2]
I'm basically using cakephp and hybridauth and it requires you to put session_start() at the beginning of your AppController.php file, which was working fine until recently. On some pages it still works ok without causing any errors, but on others like the homepage I get this error occur now.
Is there any way I can find out what models/controllers/views are being used at this point to determine the difference between the pages when it is and isn't working?

Migrated from Windows to Linux server, now getting session errors

I recently migrated from a Windows to Linux server... now I am getting a bunch of session warnings and some of the content is being loaded properly. On the Windows server, everything worked smooth and I never had any errors, as soon as the migration to Linux took place, I started getting session warnings such as the one below on every page that uses sessions.
I have no idea what I should try or where to begin to address these problems and would appreciate any advice.
I suspect that if session_start() was actully was the problem, I would have gotten a similar warning on the Windows server.
Also my site is hosted by goaddy and I do not have access to the php.ini file...
Warning: session_start() [function.session-start]: Cannot send session
cookie - headers already sent by (output started
at /home/content/12/9453412/html/mainsearch.php:32)
in /home/content/12/9453412/html/mainsearch.php on line 36
Your problem is, that in
/home/content/12/9453412/html/mainsearch.php line 32
(and possibly also in the following ones) you do some kind of output (echo, print, blanks outside of <?php ... ?> etc.), before you do session_start(); on line 36. This is not allowed, as session_start() wants to send headers which is not possible after some kind of output already occured.
Solution: Put your session_start(); to the top of your php file, or at least before you do any kind of output.
And Michael pointed out correctly that this didn't work correctly on you Windows server either, you just didn't know because error reporting was set not to display warnings.

Installing a WP theme ive made locally to a web server

Warning: Cannot modify header information - headers already sent by (output started at /home/content/82/6985782/html/wordpress/wp-content/themes/syntax/themeoptions.php:289) in /home/content/82/6985782/html/wordpress/wp-content/themes/syntax/themeoptions.php on line 136
Thats the error i get whenever i want to submit something in the admin panel.
Here's the code for the themeoptions.php:
http://pastebin.com/aFWHjEv0
It all works perfectly normal on localhost, any explanations??
It's probably output_buffering that is enabled on your local machine, but not on the remote server. (You can find out by using phpinfo).
The easy fix is to prepend your script with a output_buffering command:
<?php
ob_start();
Even better is finding out where the output starts and fix it there.

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