<?php
include 'koneksi.php';

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

$query = "select * from admin where username='$username' and password='$password";
$result = mysqli_query($koneksi, $query) or die (mysqli_error);
while($row=mysqli_fetch_array($result, MYSQLI_BOT)){
echo "berhasil";
}