$app_id = "YourAppID";
    $app_secret = "YourSecretID";
    $my_url = "http://www.thePageThatHandlesTheData.php";

    $code = $_REQUEST["code"];

    if(empty($code)) {
        $dialog_url = "http://www.facebook.com/dialog/oauth?client_id="
            . $app_id . "&redirect_uri=" . urlencode($my_url) ."&scope=user_about_me,user_education_history,user_interests,user_location,user_website,user_work_history,email,publish_stream";

        echo("<script> top.location.href='" . $dialog_url . "'</script>");
    }

    $token_url = "https://graph.facebook.com/oauth/access_token?client_id="
        . $app_id . "&redirect_uri=" . urlencode($my_url) . "&client_secret="
        . $app_secret . "&code=" . $code;

    $access_token = file_get_contents($token_url);

    $graph_url = "https://graph.facebook.com/me?" . $access_token;

    $user = json_decode(file_get_contents($graph_url));

$user holds a massive array of data....

Of course there's a lot more data handling that this script does that I haven't pasted in here, but that probably won't fit your particular application.