Question

I want to share my session variables in PHP using many subdomains. I have that example :

• example.com
• subdomain1.example.com

I try to use the same session variables between the two domains. I already tested a lot of functions in PHP but nothing work. Here is my way to test :

On the example.com/page.php, I have that test :

echo '<pre>';
var_dump(session_set_cookie_params(0, '/', '.example.com')); 
session_start(); 
echo "Session ID : ".session_id()."\n";
$_SESSION['foo'] = 'bar';
print_r($_SESSION);

And on subdomain1.example.com/page.php, I have that one :

echo '<pre>';
session_set_cookie_params(0, '/', '.example.com');
session_start();
echo "Session ID : ".session_id()."\n";
print_r($_SESSION);

I can see that the session id is the same between the two pages, but session variables are impossible to read in subdomain1.example.com/page.php

I tested many functions, like set a name to the session, but with no more results.

Thank you.

Answer 1

The only way I can think of to do this would be to save the session data to a cookie, then open the cookie when the other domain is accessed. You can read how to do this here: http://www.depiction.net/tutorials/php/cookies-session-variables.php

Out of curiosity, why do you want to do this?