Question

Basically i have a classic vhost with:

ServerName www.site.com
ServerAlias site.com

I would like to have always $_SERVER['SERVER_NAME'] = 'www.site.com'; even when someone open site.com

Is this possible?

Answer 1

No, PHP does not know anything about ServerName, ServerAlias etc.

The proper solution is configuring your webserver to redirect from all your alias domains to the main domain. That’s also a good thing from a SEO point of view.

You can do this e.g. using mod_rewrite:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\..+$ [NC]
RewriteCond %{HTTP_HOST} (.+)$ [NC]
RewriteRule ^(.*)$ http://www.%1/$1 [R=301,L]

If you have additional domains, simply setup a separate VirtualHost for them which redirects to your main domain:

<VirtualHost ...>
        ServerName site2.com
        ServerAlias *.site2.com
        Redirect / http://www.site.com/
</VirtualHost>