Re: server name that the user agent used

Tom Worster wrote:

On 9/13/09 10:24 PM, "Tommy Pham" <tommyhp2@yahoo.com> wrote:

--- On Sun, 9/13/09, Tom Worster <fsb@thefsb.org> wrote:

From: Tom Worster <fsb@thefsb.org> Subject: [PHP] server name that the user agent used To: "PHP General List" <php-general@lists.php.net> Date: Sunday, September 13, 2009, 8:21 PM when using apache with one vhost that responds to a few different hostnames, e.g. domain.org, y.domain.org, x.domain.org, let's say the vhost's server name is y.domain.org and the other two are aliases, is there a way in php to know which of these was used by the user agent to address the server?

Did you see what comes up with php_info() for $_SERVER["SERVER_NAME"] or $_SERVER["HTTP_HOST"] ?

SERVER_NAME returns whatever apache has as the vhost's configured server name. the php manual says of HTTP_HOST: "Contents of the Host: header from the current request, if there is one." in which the last 4 words are a little off-putting. but: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23 i much more encouraging. the field is mandatory and should have what i'm looking for. it's absence is cause for a 400. casual testing (with a modern non-ie browser) seems to bear this out. so i'll try using that with fallback to my current techniques if i don't find a good value in HTTP_HOST.

The reason that it might not be available is that PHP is not always running in a web context. $_SERVER['HOST_NAME'] would have no meaning, for instance, in the CLI SAPI. However, if running under a web SAPI, and if the web server provides the info, PHP will pass it on to its scripts. Regards, Torben