if(!isset($_COOKIE[$cookie_name])) {
    echo "Welcome! ";
    $count = 1;
    $values = array($count,time());

    setcookie($cookie_name, base64_encode(serialize($values)), time() + (86400 * 30), "/");

} else {

    echo "Welcome back!<br>";
    $values = unserialize(base64_decode($_COOKIE[$cookie_name]));

    echo "Your last login was at : ".$values[1]."<br>";
    echo "You have logged in ".$values[0]." times before";
    $values[0]+=1;
    $values[1] = time();
    setcookie($cookie_name, serialize($values), time() + (86400 * 30), "/"); # set new cookie

}