What are alternative solutions to passing sessions between different domains in PHP?

When passing sessions between different domains in PHP, one alternative solution is to use session cookies with a shared domain or subdomain. By setting the session cookie domain to a common root domain, sessions can be maintained across different domains. This allows for seamless session sharing between related domains.

// Set session cookie domain to a common root domain
session_set_cookie_params(0, '/', '.yourdomain.com');
session_start();