Allow PHP Sessions to Carry Over to Subdomains

keeping sessions alive over subdomains

In your .htaccess you can set your session cookie domain to the base.

php_value session.cookie_domain ".domain-uk.net"

You can also do this inside of your application:

<?php 
session_set_cookie_params(0, '/', '.domain-uk.net'); 
session_start(); 
?>

PHP session works on all subdomains

There are several things to take in account while sharing $_SESSION across subdomains.

1. Are all subdomains on ran by the same server?

   1. If not, then, you will need to share sessions amongst servers, there are several solutions:

      • Use NFS (not recommended)
      • Move SESSION to another storage (Database, Memcache, Redis) (best option imho)

   2. If they are, you may just need to configure your cookie domain using session.cookie_domain ini directive.

2. Are you running Suhosin, if you do, you may need to disable some security options to allow your session to be decrypted on the others servers.

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