Tolong Bantu saya Kaka :"(

Notice: Undefined variable: qu in /storage/ssd3/922/15228922/public_html/koneksi.php on line 4 Warning: mysqli_connect(): (HY000/2005): Unknown MySQL server host 'https://databases.000webhost.com/' (1) in /storage/ssd3/922/15228922/public_html/koneksi.php on line 7 Warning: mysqli_error() expects parameter 1 to be mysqli, boolean given in /storage/ssd3/922/15228922/public_html/koneksi.php on line 7

Saya di local bisa tapi saat di hosting di hosting gratis ko kaya gitu ya ka ?

Berikut kode saya pak

<?php

//panggil database

include "koneksi.php";

$pass = md5($_POST['password']);

$username = mysqli_escape_string($koneksi, $_POST['username']);

$password = mysqli_escape_string($koneksi, $pass);

$level = mysqli_escape_string($koneksi, $_POST['level']);

//cek username, terdaftar atau tidak

$cek_user = mysqli_query($koneksi, "SELECT * FROM tuser WHERE username = '$username' and level = '$level' ");

$user_valid = mysqli_fetch_array($cek_user);

//uji jika username terdaftar

if($user_valid){

    //jika username terdaftar

    //cek password sesuai atau tidak

    if($password == $user_valid['password']){

        //jika password sesuai

        //buat seasion

        session_start();

        $_SESSION['username'] = $user_valid['username'];

        $_SESSION['nama_lengkap'] = $user_valid['nama_lengkap'];

        $_SESSION['level'] = $user_valid['level'];

        //uji level user

        if($level == "Admin"){

            header('location:home_Admin.php');

        } elseif ($level == "User"){

            header('location:home_User.php');

        }

    } else{

        echo "<script>alert('Mohon maaf login gagal, Cek Password Anda!!');document.location='index.php'</script>";

    }

} else{

    echo "<script>alert('Mohon maaf login gagal, Cek Username Anda !!');document.location='index.php'</script>";

}

?>

File Koneksinya ka ::::

<?php

$server = "localhost";

$user = "root";

$password = "";

$database = "dblatihan";

$koneksi = mysqli_connect($server, $user, $password, $database) or die(mysqli_error($koneksi));

?>