daftar.php

<?php

require("config.php");

if (!empty($_POST)) {
    if (empty($_POST['username'])  || empty($_POST['nama'])
        ||  empty($_POST['password'])) {

        $response["sukses"] = 0;
        $response["pesan"] = "Semua harus diisi.";
        die(json_encode($response));
    }

    $query        = "SELECT 1 FROM pengguna WHERE username = :png";
    $query_params = array(
        ':png' => $_POST['username']
    );

    try {
        $stmt   = $db->prepare($query);
        $result = $stmt->execute($query_params);
    }
    catch (PDOException $ex) {
        $response["sukses"] = 0;
        $response["pesan"] = "Database Error1. Silahkan coba lagi!";
        die(json_encode($response));
    }
    $row = $stmt->fetch();
    if ($row) {
        $response["sukses"] = 0;
        $response["pesan"] = "Maaf, nama pengguna sudah digunakan.";
        die(json_encode($response));
    }
    $query = "INSERT INTO pengguna ( username, password, nama)
                VALUES ( :png, :snd, :nama) ";
    $password = md5($_POST['password']);
    $query_params = array(
        ':png' => $_POST['username'],
        ':snd' => $password,
        ':nama' => $_POST['nama']
    );

    try {
        $stmt   = $db->prepare($query);
        $result = $stmt->execute($query_params);
    }
    catch (PDOException $ex) {
        $response["sukses"] = 0;
        $response["pesan"] = "Database Error2. Silahkan coba lagi!";
        die(json_encode($response));
    }

    $response["sukses"] = 1;
    $response["pesan"] = "Nama pengguna berhasil ditambahkan!";
    echo json_encode($response);


} else {
?>
    <h1>Daftar</h1>
    <form action="daftar.php" method="post">
        Username:<br />
        <input type="text" name="username" value="" />
        <br />
        Nama:<br />
        <input type="text" name="nama" value="" />
        <br />
        Password:<br />
        <input type="text" name="password" value="" />
        <br /><br />
        <input type="submit" value="Daftar" />
    </form>
    <?php
}

?>