PHP - mysqli

<?php

        // $conn =  new mysqli("localhost", "root", "abc123", "RamaBook");
        $conn =  mysqli_connect("localhost", "root", "abc123", "RamaBook");

        $query = "select name, city from customers";

        //$result = mysqli_query($conn, $query);
        $result = $conn -> query($query);

        //$num_results = mysqli_num_rows($result);
        $num_results = $result -> num_rows;

        for($i=0; $i < $num_results; $i++) {

            //$row =  mysqli_fetch_object($result);
            $row = $result -> fetch_object();

            echo $row->name .  " " . $row->city;
            echo "<br>";
        }
        ?>