How to Manage PHP Sessions Across Subdomains?

PHP Sessions Across Subdomains: A Comprehensive Guide

When utilizing PHP sessions for user data management, users may encounter session invalidation upon accessing subdomains. This issue arises because, by default, PHP sessions are constrained to the primary domain. Fortunately, there are several approaches to enable sessions to persist across subdomains for a specific domain, such as *.mydomain.example.

The most straightforward method to achieve this is through the php.ini configuration file, where you can specify the session cookie domain as follows:

session.cookie_domain = ".example.com"

Alternatively, for Apache-based servers, you can modify the .htaccess file to include the line:

php_value session.cookie_domain .example.com

For scripts that run dynamically, setting the cookie domain can be accomplished at the beginning of the script using the following line:

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

Lastly, if you're using PHP-FPM, the php-fpm pool configuration for your site can be modified to set the cookie domain as such:

php_value[session.cookie_domain] = .example.com

By implementing any of these methods, PHP sessions will be able to carry over to all subdomains within the specified domain, ensuring seamless user experiences and data persistence.

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