<?php
  $host = 'localhost'; //127.0.0.1
  $user = 'root';
  $pass = '';
  $db = 'coba';

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

    if ($koneksi->connect_errno) {
        # code...
        echo "Gagal Konek Ke Database". $koneksi->connect_error;
    }

?>