How do those mirror websites transfer traffic to you ? they use a CNAME ? or redirects ? you can add an identification parameter to the redirect url if that is the case.

if mirror1.com redirects to mydomain.com then can it be changed to mydomain.com/?d=1 etc?

and there you can pick up the idetification, secondly i believe domain host should always work unless there is some special case i dont know about.

Ofcourse there are many more ways too.

Anyango, thank you for your reply.

No, there are no CNAME or redirects.

All domains which point to the same website are added as server alias in Apache virtual host file:

ServerAlias domain.es domain.de domain.co.uk

So, can anyone show me an example how can I enter website www.mydomain.com telling php that HTTP_HOST is something different than www.mydomain.com ?

I just wonder how is it possible.

Thanks.

Just setup an array of the domains you want to use and they are setup on your host, ex:

$domain_array = array(
'www.example.com',
'sub1.example.com',
'sub2.example.com'
);

// Validate host
$host = $_SERVER["HTTP_HOST"];
if( !in_array($host, $domain_array) ) {
header("HTTP/1.1 301");
header("Location: http://www.example.com");
exit();
}

// Various themes domain dependent
$theme_array = array(
www.example.com' => array(
'template' => 'www',
'language' => 'english'
),
'sub1.example.com' => array(
'template' => 'sub1',
'language' => 'spanish'
),
);

// get current domain parameters
$theme_parameters = $theme_array[$host];

.........

So in the end the parameters loaded can be used for the domain the request is for. You don't need to pass any parameters in the urls and mess the links.

This is what I found in php.net:

SERVER_NAME is the name defined in the apache configuration

If it's true, I can set up separate virtual hosts for each domain with the same document root.

Then

$servername = getenv("SERVER_NAME");

will show information from Apache configuration file and not from headers. Is it true? If yes, it's a good solution how I can detect which domain is being used by user.