How Can I Preserve PHP Session Variables Across Multiple Domains?

Preserving Session Variables Across Different Domains

Problem:

When navigating between websites with distinct domains, session variables stored with PHP's default configuration fail to persist. This poses a challenge when attempting to retain payment information across different websites for a company.

Solution:

1. Cross-Domain Session Ids:

By default, session cookies are domain-specific, preventing them from being shared between different websites. To overcome this, one can either:

• Append session IDs to Query Strings: This method has security implications due to URL sharing.
• Use Cross-Domain JavaScript Requests: This facilitates seamless session ID transfer between cooperating domains.

2. Shared Session Data:

In addition to the cookie issue, session data by default resides on the local filesystem of the originating server. To achieve cross-domain sharing, one must employ:

• Custom Session Handler: This allows data storage in a database or other globally accessible location.

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