Why can't I access session variables from my AJAX-called PHP script?

Question

I have one PHP script with a session variable, set like so:

$_SESSION[\'VAR1\'] = \"test\"

Now, I am using AJAX via a jQuery-initiated POST

Answer 1

Make sure that the domain names for both pages (i.e. the AJAX container and the AJAX script are same). Here is an example:

http://mydomain.com/login.php           (set session variables here)
http://mydomain.com/ajax-container.php  (session variables are visible here)
http://mydomain.com/ajax-script.php     (session variables are visible here)
http://www.mydomain.com/ajax-script.php (session variables are NOT visible here)

Another one:

http://www.mydomain.com/login.php          (set session variables here)
http://www.mydomain.com/ajax-container.php (session variables are visible here)
http://www.mydomain.com/ajax-script.php    (session variables are visible here)
http://mydomain.com/ajax-script.php        (session variables are NOT visible here)