多个站点范围的cookie / $ config ['cookie_domain']

Question

Under the site-enabled www.test.com, I have multiple VirtualHost configurations. ServerName varies (eg. test1.com, test2.com, test3.com) but points only into one DocumentRoot.

I can detect which server name the user is currently in by using $_SERVER['SERVER_NAME']. However we have a particular page which requires pointing to a specific subdomain. Enabling site-wide cookies is definitely a go for this project.

My concern thus: Is there anyway to have multiple $config['cookie_domain'] in config.php? So I can have this matching idea:

$server_name = $_SERVER['SERVER_NAME'];

if($server_name == "test1.com")
    $config['cookie_domain'] = ".test1.com";
else if($server_name == "test2.com")
    $config['cookie_domain'] = ".test2.com";
... // so on

I even tried adding this into config.php but no luck.

Answer 1

Yes, what you're doing should work for each individual domain, but the nature of cookies is that they are inherently not cross-domain. You'll need some additional magic to make cookies (or session data) accessible across multiple top-level domains.