cookie for multiple domains

[Anon]

I have a doorway page on my site that leads to 2 different domains. I want to set a cookie at the doorway page that works for both domains. Right now I can only get it to work for one of them.

Splash page is domain1.com, users can either go inside domain1.com or go to domain2.com. I can read the cookie from anywhere in domain1.com but not the other.

I've tried a million different options and none of them will let me set a cookie for domain2 or access the domain1 cookie from inside domain2.

Anyone have any suggestions?
Thanks in advance,
Mike

here's some variations i've tried:
setcookie("agent", $AGENT, mktime(18,30,0,5,12,2020),"/","domain2.com");
setcookie("agent", $AGENT, mktime(18,30,0,5,12,2020),"/","domain1.com, domain2.com");
setcookie("agent", $AGENT, mktime(18,30,0,5,12,2020),"",".domain1.com, .domain2.com");

[Anon]

yeah, it wont work that way.

Try this one.
When you set the cookie on one server, have that page header redirect the client to the page on the other server.
That page sets the cookie for that server and then header redirects the client back to the page they were logging into.

hope this helps.

[Anon]

Best of my knowledge, the cookie path is set from the URL from which is was issued, IE: you cannot assign a cookie path! This is a security issue with the "cookie protocol".

You can however pass vars from one PHP page to another PHP page on another URL, that may be your work around.

Setting a cookie var at foo.com sets the cookie path to foo.com, and therefore cannot be read at boo.com, no matter how hard you try to play with headers, etc..

HTH