How Can I Share Session Variables Across Different Domains?

Cross-Domain Session Variables

Your issue arises from session IDs being domain-specific, and thus inaccessible across different domains.

Cross-Domain Session IDs

Session IDs are typically transmitted via cookies. However, since your websites are hosted on separate domains, the session cookie's domain restriction prevents its transfer.

To overcome this, consider appending session IDs to the query string of all requests. While PHP partially supports this approach, it suffers from several drawbacks, such as security concerns due to URL sharing.

A superior solution involves leveraging JavaScript to facilitate cross-domain requests. This allows for a seamless transfer of session IDs across multiple servers.

Shared Session Data

Even with cross-domain session IDs resolved, storing session data in a location accessible to all involved web servers is crucial. By default, session data resides on the local file system, which is unsuitable for cross-domain scenarios.

A viable solution is to implement a custom session handler that stores session data in a database or another shared storage system. This ensures that the session data can be accessed by all necessary servers, enabling cross-domain session functionality.

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