epyson

if ($_POST) {  
        $name = $_POST['name'];
        $surname = $_POST['surname'];
        $message = $_POST['message'];

        $sql = "INSERT INTO `comments` (`name`, `surname`, `message`) VALUES(:name, :surname, :message)";
        $query = $conn->prepare($sql);
        $query->execute(['name' => $name, 'surname' => $surname, 'message' => $message]);
}