How to Prevent Session Loss When Accessing Subdomains in PHP?

Overcoming Session Loss When Navigating to Subdomains in PHP

When utilizing PHP sessions to manage user data, you may encounter a frustrating issue where users get "logged out" upon accessing a subdomain, such as user.mydomain.example. This situation arises because sessions are typically isolated by domain.

To resolve this issue, you need to configure your PHP setup to allow cross-subdomain session sharing for your desired domain pattern, *.mydomain.example. Fortunately, there are several approaches to achieve this:

Option 1: Modify php.ini

Update the session.cookie_domain directive in your php.ini file to the following:

session.cookie_domain = ".example.com"

Option 2: Use .htaccess

Add the following line to your .htaccess file:

php_value session.cookie_domain .example.com

Option 3: Set in PHP Script

As the very first line of your PHP script, include the following code:

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

Option 4: PHP-FPM Pool Configuration

In your PHP-FPM pool configuration for the specific site, set the session.cookie_domain value as follows:

php_value[session.cookie_domain] = .example.com

Now, users can seamlessly navigate between subdomains without losing their session data.

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