How Can I Share PHP Sessions Across Subdomains?

Sharing PHP Sessions Across Subdomains

To enable session sharing across subdomains, it is essential to define the session.cookie_domain directive in your php.ini file. However, in your case, this configuration doesn't seem to be propagating session data between subdomains effectively.

To troubleshoot this issue, try setting the session name and cookie parameters explicitly in your PHP code:

session_name('my_session');
session_set_cookie_params(0, '/', '.example.com');
session_start();

Here, we assign a specific name to the session (my_session) and define the domain of the cookie as .example.com. This ensures that the cookie is sent to and shared across all subdomains of example.com, allowing sessions to be maintained consistently.

After these modifications, both auth.example.com and sub1.example.com will use the same session ID and share session data seamlessly.

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