Why is the cookie disappearing?

Question

PHP

The cookie is placed in the site.ru/ref/N directory where N is $refnum
Everything is fine, the cookie is set and overwritten if a new $refnum value is given in GET
setcookie("ref", $refnum, time()+7776000);
Let's set the path parameter. Cookie is not set.
setcookie("ref", $refnum, time()+7776000, '/');
Let's change the path. The cookie is set, overwritten, but again only on this page! Others have the old one.
setcookie("ref", $refnum, time()+7776000, '../');
When setting the domain, it is again not set at all

setcookie("ref", $refnum, time()+7776000, '../', 'site.ru');

Where is the joint? )))

Answer 1

look through www.telerik.com/fiddler
check with correctly working sites
and in general study the rules of cookies