Why does the $_SERVER["REMOTE_ADDR"] include show the server ip?

Question

PHP

In the include, it $_SERVER["REMOTE_ADDR"]displays the ip of the server, I sin on htaccess, since I set up dynamic subdomains. From a subdomain I come - such a bug. Directly everything is fine.

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^(.*)\.test\.ru$
RewriteCond %{REQUEST_URI} ^/show/(.*)
RewriteRule ^(.*)$ http://test.ru/show.php?id=%1 [L,P]

Answer 1

Decided so. Crutch, but still works.

function get_client_ip() {
    $ipaddress = '';
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
        $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
        $ipaddress = $_SERVER['REMOTE_ADDR'];
    }

    return $ipaddress;
}

Answer 2

PHP script published via apache2+ nginx ?
If yes, then PHP gets the nginx host address. You can set up IP address translation through the apache module 'mod_remoteip'.