PHP get domain name
Similar question has been asked in stackoverflow before.
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,
- no DNS support
- behind load balancing software
To answer your question, these should work as long as:
- Your HTTP server passes these values along to PHP (I dont know any that dont)
- Youre not accessing the script via command line (CLI)
But, if I remember correctly, these values can be faked to an extent, so its best not to rely on them.
My personal preference is to set the domain name as an environment variable in the apache2 virtual host:
# Virtual host setEnv DOMAIN_NAME example.com
And read it in PHP:
// PHP echo getenv(DOMAIN_NAME);
This, however, isnt applicable in all circumstances.