Hello.php

<?php
include "../koneksi.php";

$fullname = $_POST['fullname'];
$username = $_POST['username'];
$password = $_POST['password'];

$sql  ="INSERT  INTO user VALUES (null,'$fullname','$username','$password')";
$query=mysql_query($sql);
$result  = mysql_num_rows($query);

$hasil=array();

if($result==1){
       $hasil['status']='success';
}else{
       $hasil['status']='gagal';
}
$data = "{result:".json_encode($hasil)."}";
echo $data;
?>