I've stripped down Google's server side PHP example code to be a lot simpler & asynchronous. The Google code makes you jump through a lot of hoops, creating a fake gif, relying on a cookie etc.
This code just skips all that and does a curl.
- The code requires that your server can run curl from the command line.
- Make sure that the $account_id you pass to the function is the mobile version, starting with "MO-".
require_once("./Ga.php");
Ga::hit("MO-XXXXXX");