Some application, not written by me, and not in PHP, creates a cookie for the domain "www.domain.com".
I am trying to replace that cookie. So in php I did:
setcookie('mycookie','mydata',time() + 2*7*24*60*60,'/','www.domain.com', false);
However the resulting cookie is created for domain: ".www.domain.com", note the dot "." ahead of the domain.
So it doesn't replace it, it creates another cookie. What can I do?
Answer
The issue is also adressed here: https://www.php.net/manual/en/function.setcookie.php
See comment by jah:
If you want to restrict the cookie to a single host, supply the domain parameter as an empty string
You could also try .domain.com as the domain. The trailing dot will allow a cookie for all subdomains for domain.com and could overwrite the www.-cookie, but I'll go with the above solution first.