Mine

<?php

if ($_COOKIE['vehicledtt'] == null) {
   include 'pickcar.php';
}
elseif ($_GET['car'] != null) {
   setcookie('vehicledtt', $_GET['car'], strtotime('+1 year'));
   echo $_COOKIE['vehicledtt'];
   echo " set ok";
}
else {
   include 'home.php';
}
?>