session_set_cookie_params() for one level domains

Hi all, Something that has taken me some time to debug and wanted to share: session_set_cookie_params() does not work when the domain param is just a one level domain, like it was a TLD. I have a site in an intranet and our internal domain is .local, so trying to set the cookie session to the .local domain does not work: session_set_cookie_params(0, '/', '.local'); // Does not work In all test I've done, setting the domain only works for SLDs and above: session_set_cookie_params(0 , '/', '.sld.local'); Does work I think this is nothing to do with PHP but the http protocol, witch does not permit setting cookies for TLDs for obvious security reasons.