Database to JSON

<?php
    $username ="daengid_isfaaghyth";
    $password ="sensor";
    $hostname = "localhost";
    $database_name = "daengid_daengbelajar";

    $con = mysqli_connect($hostname , $username, $password);
    $selected = mysqli_select_db($con, $database_name);

    $result = mysqli_query($con, "SELECT * FROM wrshop_planet");
    $json_response = array();

    while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) {
        $json_response[] = $row;
    }

    echo json_encode(array('planet' => $json_response));

?>