$_SERVER["SERVER_NAME"] returns some ip address

[programming.name]

Hi,

 

as far as I know $_SERVER["SERVER_NAME"] and $_SERVER["REQUEST_URI"] returns the server address like http://example.com/.

 

But some cases, $_SERVER["SERVER_NAME"] returns an ip address like 203.111.111.111 and  $_SERVER["REQUEST_URI"] also returns the ip address with port like 203.111.111.111:25.

 

What is  going on or going wrong?

 

Thanks.

[trq]

Its likely that the host is setup to use ip based virtual hosts instead of name based. Its an Apache config choice.