Can you help me here ! I get this wrong in my PHP code when I open it in localhost. Fatal error : Uncaught mysqli_sql_exception: A connection attempt failed because the connected party did not...

    $db =  new mysqli(DBHOST, DBUSER, DBPASS, DBDATABASE);
    //$db =  new mysqli(DBHOST, DBUSER, DBPASS, DBDATABASE);
        if($db->connect_errno > 0) {
        die("Fel vid anslutning: " . $db->connect_error);
    }

    if(isset($_POST['user'])) {
        $user = $_POST['user'];
        $content = $_POST['content'];

        // Lägg till data
        $sql = "INSERT INTO guestbook(user, content)VALUES('$user', '$content')";
        $result = $db->query($sql);
    }

    ?>

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    // SQL-fråga

    $sql = "SELECT * from guestbook ORDER BY created DESC";
    $result = $db->query($sql);

    while($row = $result->fetch_assoc()) {
        ?>

            }
    ?>