taiiiiiii

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

    	 class usr{}

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

    	 if (empty($nama)) {
    	 	$response = new usr();
    	 	$response->success = 0;
    	 	$response->message = "Kolom nama tidak boleh kosong!";
    	 	die(json_encode($response));
    	 } else if (empty($username)) {
    	 	$response = new usr();
    	 	$response->success = 0;
    	 	$response->message = "Kolom username tidak boleh kosong!";
    	 	die(json_encode($response));
    	 } else if (empty($password)) {
    	 	$response = new usr();
    	 	$response->success = 0;
    	 	$response->message = "Kolom password tidak boleh kosong!";
    	 	die(json_encode($response));
    	 } else {
    		 if (!empty($username) && !empty($password) && !empty($nama)){
    		 	$num_rows = mysqli_num_rows(mysqli_query($con, "SELECT * FROM tb_login WHERE username='".$username."'"));

    		 	if ($num_rows == 0){
    		 		$query = mysqli_query($con, "INSERT INTO tb_login (nama, username, password) VALUES('".$nama."','".$username."','".$password."')");

    		 		if ($query){
    		 			$response = new usr();
    		 			$response->success = 1;
    		 			$response->message = "Register berhasil, silahkan login.";
    		 			die(json_encode($response));

    		 		} else {
    		 			$response = new usr();
    		 			$response->success = 0;
    		 			$response->message = "Register Gagal!";
    		 			die(json_encode($response));
    		 		}
    		 	} else {
    		 		$response = new usr();
    		 		$response->success = 0;
    	    		$response->message = "Username sudah ada";
    		 		die(json_encode($response));
    		 	}
    		 }
    	 }

    	mysqli_close($con);
    }
?>