It does exist, if the server is set to resolve automatily.
From PHP docs:
Your web server must be configured to create this variable. For example in Apache you'll need HostnameLookups On inside httpd.conf for it to exist.
//Simon
John Taylor-Johnston wrote:
Aw gee, $_SERVER['REMOTE_HOST'] (only REMOTE_ADDR) does not exist in PHP? Bummer. Why is that?
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