mysql basic 2

<?php
$host="localhost";
$user="root";
$pass="";
$db="work_mujur";

$mysqli = new mysqli($host, $user, $pass, $db);

/* Membuka Koneksi */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}
else{
 echo 'Koneksi berhasil';
  printf("<br/>Host information: %s\n", $mysqli-> host_info);
}

$mysqli-> close();