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if (preg_match('/[^\.]+\.[a-z]{2,6}$/i', $_SERVER['HTTP_HOST'], $match)) {
// set cookie to work across all subdomains
ini_set('session.cookie_domain', '.' . $match[0]);
} "domain.com" : set ini to ".domain.com"
"sub.domain.com" : set ini to ".domain.com"
"sub.sub.domain.com" : set ini to ".domain.com"
"domain.ca.us.gov" : set ini to ".domain.ca.us.gov"
"sub.domain.ca.us.gov" : set ini to ".domain.ca.us.gov"
"localhost" : do not set ini
It seems like Apache would know the difference between subdomain, domain and TLD. Does it? And if so, how can I find out from php?