Using same cookie across selective subdomains

Question

I have been trying to find out a way to share cookies across multiple subdomains.

Setting the cookie like:

setcookie('token', base64_encode(serialize($token)), time()+10800, '/', '.mydomain.com');

does exactly that. But there is a slight problem here. This will share the cookie across all subdomains.

My problem is that I have other environments (Dev and test) set up on 2 subdomains. I am looking for a way to share cookies across "Selective" subdomains. i.e. share across some subdomains, and not share amongst others. I am not sure if anything like this exists.

Any help is appreciated. Thanks.

Answer 1

As far as I'm aware you can either share across all subdomains using '.mydomain.com' (as you are doing) or you have to be specific and target only one subdomain using, for example, 'test.mydomain.com'.

You can also use some tricks, or workarounds, like prefixing the cookie name and then doing the logic server side, but I'm not sure if this si the solution you are looking for.