sadf

<?php
    if(isset($_POST["username"]) && isset($_POST["password"])){
    include_once "koneksi.php";

	 class usr{}

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

	 if ((empty($username)) || (empty($password))) {
	 	$response = new usr();
	 	$response->success = 0;
	 	$response->message = "Kolom tidak boleh kosong";
	 	die(json_encode($response));
	 }

	 $query = mysqli_query($con, "SELECT * FROM tb_login WHERE username='$username' AND password='$password'");

	 $row = mysqli_fetch_array($query);

	 if (!empty($row)){
	 	$response = new usr();
	 	$response->success = 1;
	 	$response->message = "Selamat datang ".$row['username'];
	 	$response->id = $row['id_user'];
	 	$response->username = $row['username'];
	 	die(json_encode($response));

	 } else {
	 	$response = new usr();
	 	$response->success = 0;
	 	$response->message = "Username atau password salah";
	 	die(json_encode($response));
	 }

	mysqli_close($con);
    }
?>