DragonPro

RewriteRule ^cars/([0-9a-zA-Z_-]+)$ cars/?make_id=$1 [NC,L]
RewriteRule ^cars/([0-9a-zA-Z_-]+)/([0-9a-zA-Z_-]+)$ cars/?make_id=$1&model_id=$2 [NC,L]

function get_car_url($url) {
  global $dbh;
  $cars = $dbh->prepare("SELECT * FROM `cars` WHERE `name_url` = '$url'");
  $cars->execute();
  foreach ($cars as $car) {
    return $car;
  }
  if ($url <> $car["name_url"]) {
    http_response_code(404);
    include('my_404.php');
    die();
  }
}