open a socket on a shared host

I'm trying to open a socket on a host using the following code:

$timeout = 10;
$s = stream_socket_开发者_如何学编程client('mywebsite.com:80', $errcode, $errstring, $timeout);
$message = "GET /index.php HTTP/1.0\r\n\r\n";
fwrite($s, $message);
while(!feof($s)){
    echo fread($s, 1024);
}

Nothing fancy, just an example I found. The problem is that every time I run the code I get different files. I think this is because the host is a shared one.

Is there a way to overcome this problem, that is, pull reliably the proper file I'm trying to get?

Thank you.

in the HTTP request you have to specify which host you're accessing. as you noted correctly multiple DNS entries can point to the same IP address.

$message = "GET /index.php HTTP/1.1\r\nHost: hostname.com\r\n\r\n";

You need to send the Host header to specify the domain name - it is very common for one server to host multiple websites:

$message = "GET /index.php HTTP/1.1\r\nHost: www.example.com\r\n\r\n";

Note (as @Darhazer points out) that Host request header is only defined since HTTP/1.1, so you can't use it wtih HTTP/1.0. There is a possibility to use the absolute URL, as in

$message = "GET http://www.example.com/index.php HTTP/1.0\r\n\r\n";

but this is a violation of HTTP/1.0:

The absoluteURI form is only allowed when the request is being made to a proxy.

and the target server apparently isn't a proxy, so the resulting behavior is unreliable.