How Can I Extend PHP Session Scope to Subdomains?

Extending PHP Session Scope to Subdomains

When safeguarding user data using PHP sessions instead of cookies (except for the session ID cookie), users may encounter an issue where they are prematurely "logged out" upon accessing their profiles at user.mydomain.example. This occurs due to the default session behavior, which restricts access to the same domain as the originating request.

To resolve this inconvenience, there are several options available:

• Modify php.ini:

session.cookie_domain = ".example.com"

• Edit .htaccess:

php_value session.cookie_domain .example.com

• Set in the Script:

ini_set('session.cookie_domain', '.example.com');

• Configure php-fpm Pool:

php_value[session.cookie_domain] = .example.com

By implementing one of these solutions, PHP sessions will be allowed to persist across subdomains of the specified domain (.mydomain.example). This ensures seamless user authentication and data retention, regardless of the subdomain being accessed.

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