if(mysqli_num_rows($result) > 0){
    while ($row = mysqli_fetch_array($result)) {
        $id_product = $row['id_courses'];
        $product = $row['product'];
        $title = $row['title'];
        $subtitle = $row['subtitle'];
        $price = $row['price'];
    }
}

echo $product;

$stmt->bind_param("i",$active);
$stmt->execute();
$stmt->bind_result( $id_product,$product,$subtitle,$price);

      while ($stmt->fetch()) {

      }