Session / variables no longer available (PHP)

I am trying to use php sessions on my site but the data is not available to the php ajax scripts or other pages.

It is pretty simple, I'm using:

session_start();

Then I set some session variables:

$_SESSION["myvar"] = "blah";

The session variables are available to the page itself but if I go to any other page on my site now and run

echo $_SESSION["myvar"];

I get NULL

Also I'm running some simple ajax calls to php scripts within the same page and when I check the session variables in those I also get NULL.

What's going on?
intoxicated_curveballAsked:
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Brian TaoConnect With a Mentor Senior Business Solutions ConsultantCommented:
Did you put session_start(); on the other PHP scripts, too?
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Kim WalkerWeb Programmer/TechnicianCommented:
session_start(); must be executed before the file generates any output. If you have any echos or header statements before session_start();, the session will not start.
1
 
Dave BaldwinFixer of ProblemsCommented:
To reiterate what Brian and Kim have said, every one of your PHP pages that are involved in your sessions in any way show have this as the first 3 lines of your PHP code.  This includes all pages that are called by AJAX routines.  The error reporting is there so you can see any error messages that are generated.  This is especially important when you are developing the site code.
<?php
error_reporting(E_ALL);
session_start(); 

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Ray PaseurCommented:
Here is how PHP sessions work.
https://www.experts-exchange.com/articles/11909/PHP-Sessions-Simpler-Than-You-May-Think.html

If you're following the guidance in that article and still "losing" session data, try running the script captioned A Script to Test Your Session Handler.  If that works, but you still have trouble, please set up the SSCCE and post it here, so we can install it and run it on our own systems.  

Most of the time this failure is about omitting session_start() or putting it inside some conditional logic, however in AJAX scripts it may be wise to use session_write_close() before the asynchronous script ends.
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