PHP get domain name

Similar question has been asked in stackoverflow before.

See here: PHP $_SERVER[‘HTTP_HOST’] vs. $_SERVER[‘SERVER_NAME’], am I understanding the man pages correctly?

Also see this article: http://shiflett.org/blog/2006/mar/server-name-versus-http-host

Recommended using HTTP_HOST, and falling back on SERVER_NAME only if HTTP_HOST was not set. He said that SERVER_NAME could be unreliable on the server for a variety of reasons, including:

  • no DNS support
  • misconfigured
  • behind load balancing software

Source: http://discussion.dreamhost.com/thread-4388.html

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