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Penggunaan fungsi AUTHENTICAT di PHP

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Pada tutorial kali ini, kita akan membuat fitur login untuk admin dengan session library bawaan dari Codeigniter

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Mari kita mulai

Apa itu Sesi?

Dalam ilmu komputer atau jaringan komputer, sesi adalah informasi sementara yang disimpan saat dua perangkat atau komputer saling berkomunikasi atau bertukar data.

Ingat kata sandinya. Informasi sementara

Jadi, ketika kita membuka website. di sana kita dapat mengatakan bahwa kita memulai sesi baru

Lalu ketika kita menutup website tersebut, berarti sesi kita berakhir

Data sementara yang disimpan dalam sesi dapat digunakan untuk otentikasi atau login

Data sesi dapat disimpan di klien dan server

Data sesi yang disimpan di klien akan hilang saat browser atau tab ditutup. Sedangkan session yang tersimpan di server akan hilang ketika server direstart atau dihapus secara manual

Nah, untuk tutorial ini. kita akan login dengan menyimpan session di server

Kenali Sesi Perpustakaan

Sebenarnya PHP sendiri sudah menyediakan fitur session yang bisa diakses dari variabel global

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
2

Namun, jika kita menggunakan sesi bawaan PHP, kita harus memanggil fungsi 

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
3 di awal eksekusi

Nah, di Codeigniter. kita tidak perlu memanggil fungsi 

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
3

Kita cukup menggunakan library 

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
_5 yang telah disediakan oleh Codeigniter

Cara Memuat Sesi Perpustakaan

Silakan buka file 

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
_6 kemudian, di bagian 
// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
7. tambahkan 
// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
_5 seperti ini

$autoload['libraries'] = array('database', 'session');

Jadi library 

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
_5 sudah terload secara otomatis dan kita akan bisa menggunakannya dari aplikasi Codeigniter

Cara Menggunakan Perpustakaan Sesi

Kita dapat menggunakan sesi perpustakaan dengan metode ini

$this->session->nama_method_session();
_

Ada beberapa metode yang akan sering kita gunakan dalam sesi library

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();

Parameter 

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
_0 kita perlu membuat dan mengakses konten sesi

Penjelasan lebih detail tentang library ini, bisa juga Anda baca di dokumentasi session library

Oke sekarang

Biar lebih paham, yuk langsung praktek

1. Buat Tabel Pengguna

Buat tabel baru bernama 

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
_1 dengan struktur seperti ini

Penggunaan fungsi AUTHENTICAT di PHP

Biar cepat, kamu bisa menggunakan query SQL berikut

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;

Jalankan kode SQL ini pada database 

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
2 di menu SQL

Penggunaan fungsi AUTHENTICAT di PHP

Setelah itu, tambahkan satu data dengan menjalankan kode SQL berikut

INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');

Kemudian kita akan memiliki data baru dengan

  • surel. 
    CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
    _3
  • nama belakang. 
    CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
    _4
  • kata sandi. 
    CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
    _4

Kata sandi kami disimpan dalam bentuk hash dengan fungsi 

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
6 dan algoritma 
CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
7

2. Membuat Model Otentikasi

Buat model baru dengan nama 

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
8 dengan konten berikut

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}

Ada empat metode dalam model ini

  1. Metode 
    CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
    _9 untuk login dengan input berupa 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    0 dan 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    1. Fungsi ini mengembalikan nilai 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    _2 jika login berhasil, selain itu akan mengembalikan 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    3 jika login gagal;
  2. Metode 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    _4 untuk mendapatkan data pengguna yang sedang login. Fungsi ini akan menghasilkan 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    _5 jika pengguna tidak login, dan akan menghasilkan data objek dari pengguna yang sedang login jika status pengguna login
  3. Metode 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    _6 untuk keluar atau menghapus sesi;
  4. Metode 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    _7 berfungsi untuk memperbarui tanggal 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    8

3. Buat Pengontrol Autentikasi

Buat Controller baru dengan nama 

INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
_9 dengan isi sebagai berikut

<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}

Pada Pengontrol 

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
_0, kami membuat dua metode penting yaitu

  1. CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
    _9 untuk menampilkan formulir login dan memproses login;
  2. dan 
    INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
    _6 untuk keluar

Sementara itu, kami tidak menggunakan metode 

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
3. Jadi kita bisa menelepon 
<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
_4 di sana

Oke lanjutkan

Sekarang kita harus

4. Buat Lihat Formulir Login

Kami membutuhkan tampilan untuk menampilkan formulir login

Buat file baru bernama 

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
_5 di folder 
<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
6 dengan isi sebagai berikut

<!DOCTYPE html>
<html lang="en">

<head>
	<?php $this->load->view('_partials/head.php'); ?>
</head>

<body>
	<?php $this->load->view('_partials/navbar.php'); ?>

	<div class="container">
		<h1>Login</h1>
		<p>Masuk ke Dashboard</p>

		<?php if($this->session->flashdata('message_login_error')): ?>
			<div class="invalid-feedback">
					<?= $this->session->flashdata('message_login_error') ?>
			</div>
		<?php endif ?>

		<form action="" method="post" style="max-width: 600px;">
			<div>
				<label for="name">Email/Username*</label>
				<input type="text" name="username" class="<?= form_error('username') ? 'invalid' : '' ?>"
					placeholder="Your username or email" value="<?= set_value('username') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('username') ?>
				</div>
			</div>
			<div>
				<label for="password">Password*</label>
				<input type="password" name="password" class="<?= form_error('password') ? 'invalid' : '' ?>"
					placeholder="Enter your password" value="<?= set_value('password') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('password') ?>
				</div>
			</div>

			<div>
				<input type="submit" class="button button-primary" value="Login">
			</div>
		</form>
	</div>
	<?php $this->load->view('_partials/footer.php'); ?>
</body>

</html>

Sejauh ini fitur login sudah bisa dicoba

Namun, halaman admin belum dapat dilindungi

Oleh karena itu, silakan lanjutkan

5. Mengubah Pengontrol Admin

Kami ingin setiap kali kami membuat halaman admin, pengguna harus login terlebih dahulu

Kita dapat melakukannya dengan memanggil fungsi 

INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
4 pada konstruktor Controller halaman admin

Mari kita ubah segalanya

Ubah Pengontrol 📜 

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
8 menjadi seperti ini

<?php

class Dashboard extends CI_Controller
{
	public function __construct()
	{
		parent::__construct();
		$this->load->model('auth_model');
		if(!$this->auth_model->current_user()){
			redirect('auth/login');
		}
	}

	// .. ada kode lain di sini ...
}

Lalu ubah juga Controller 📜 

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
9 menjadi seperti ini

<?php

class Feedback extends CI_Controller
{
	public function __construct()
	{
		parent::__construct();
		$this->load->model('auth_model');
		if(!$this->auth_model->current_user()){
			redirect('auth/login');
		}
	}

	// .. ada kode lain di sini ...
}

Ubah Pengontrol 📜 

<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
0 menjadi seperti ini

$this->session->nama_method_session();
_0

Terakhir ubah Controller 📜 

<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
1 menjadi seperti ini

$this->session->nama_method_session();
_1

Dengan begini, saat kita membuka admin controller, kita akan diminta untuk login terlebih dahulu

6. Percobaan

Sekarang coba masuk dengan membuka

$this->session->nama_method_session();
_2

atau

$this->session->nama_method_session();
_3

Silakan masukkan nama pengguna dengan 

CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
_4 dan kata sandi 
CREATE TABLE `user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(32) NOT NULL,
  `email` varchar(64) NOT NULL,
  `username` varchar(64) NOT NULL,
  `password` varchar(255) NOT NULL,
  `avatar` varchar(32) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `last_login` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
4

Penggunaan fungsi AUTHENTICAT di PHP

Jika berhasil login, maka kita akan diarahkan ke halaman admin

Namun, jika kita memasukkan username dan password yang salah. maka login akan gagal dan akan tetap berada di halaman login

Penggunaan fungsi AUTHENTICAT di PHP

Setelah berhasil masuk, coba keluar sekarang

Penggunaan fungsi AUTHENTICAT di PHP

Kemudian kita akan dibawa kembali ke halaman login

Untuk memastikan halaman admin dilindungi dengan login, coba buka kembali halaman admin setelah logout

$this->session->nama_method_session();
_4

Jika halaman admin berhasil dibuka, berarti fitur login tidak berfungsi seperti yang diharapkan

Namun, jika kita diarahkan ke halaman login. Itu berarti kita telah berhasil membuat halaman login

7. Menampilkan pengguna yang sedang login

Kami ingin menampilkan data pengguna yang sedang login di bagian navbar

Bagaimana cara mendapatkan data pengguna?

Kita dapat menggunakan metode 

INSERT INTO `user` (`id`, `name`, `email`, `username`, `password`, `avatar`, `created_at`, `last_login`) VALUES
('6118b2a943acc2.78631959', 'Administrator', '[email protected]', 'admin', '$2y$10$hRi1qju2KOeEPcBZ0wYfhu/PN5e9Wl.ddWeDTds8Uokad764X9D1a', NULL, '2021-08-15 06:22:33', '2021-08-19 15:55:42');
_4 dari model 
<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
5

Kami akan banyak mengubah pengontrol admin, karena semua tampilan admin memuat tampilan navbar

Mari bekerja satu per satu

1. Mengubah Pengontrol Admin

Ubah Pengontrol 

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
_8, dalam metode 
<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
3 tambahkan data 
<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
8 seperti ini

$this->session->nama_method_session();
_5

Selanjutnya, ubah pengontrol 

<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
_9 ke metode 
<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
3, tambahkan data 
<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
8 seperti ini

$this->session->nama_method_session();
_6

Selanjutnya, tambahkan data 

<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
_8 ke controller 
<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
0 seperti ini

$this->session->nama_method_session();
_7

Terakhir, ubah pengontrol 

<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
_1, dalam metode 
<?php

class Auth_model extends CI_Model
{
	private $_table = "user";
	const SESSION_KEY = 'user_id';

	public function rules()
	{
		return [
			[
				'field' => 'username',
				'label' => 'Username or Email',
				'rules' => 'required'
			],
			[
				'field' => 'password',
				'label' => 'Password',
				'rules' => 'required|max_length[255]'
			]
		];
	}

	public function login($username, $password)
	{
		$this->db->where('email', $username)->or_where('username', $username);
		$query = $this->db->get($this->_table);
		$user = $query->row();

		// cek apakah user sudah terdaftar?
		if (!$user) {
			return FALSE;
		}

		// cek apakah passwordnya benar?
		if (!password_verify($password, $user->password)) {
			return FALSE;
		}

		// bikin session
		$this->session->set_userdata([self::SESSION_KEY => $user->id]);
		$this->_update_last_login($user->id);

		return $this->session->has_userdata(self::SESSION_KEY);
	}

	public function current_user()
	{
		if (!$this->session->has_userdata(self::SESSION_KEY)) {
			return null;
		}

		$user_id = $this->session->userdata(self::SESSION_KEY);
		$query = $this->db->get_where($this->_table, ['id' => $user_id]);
		return $query->row();
	}

	public function logout()
	{
		$this->session->unset_userdata(self::SESSION_KEY);
		return !$this->session->has_userdata(self::SESSION_KEY);
	}

	private function _update_last_login($id)
	{
		$data = [
			'last_login' => date("Y-m-d H:i:s"),
		];

		return $this->db->update($this->_table, $data, ['id' => $id]);
	}
}
3 tambahkan data 
<?php

class Auth extends CI_Controller
{
	public function index()
	{
		show_404();
	}

	public function login()
	{
		$this->load->model('auth_model');
		$this->load->library('form_validation');

		$rules = $this->auth_model->rules();
		$this->form_validation->set_rules($rules);

		if($this->form_validation->run() == FALSE){
			return $this->load->view('login_form');
		}

		$username = $this->input->post('username');
		$password = $this->input->post('password');

		if($this->auth_model->login($username, $password)){
			redirect('admin');
		} else {
			$this->session->set_flashdata('message_login_error', 'Login Gagal, pastikan username dan passwrod benar!');
		}

		$this->load->view('login_form');
	}

	public function logout()
	{
		$this->load->model('auth_model');
		$this->auth_model->logout();
		redirect(site_url());
	}
}
8 seperti ini

$this->session->nama_method_session();
_8

Berurusan dengan Pengontrol selesai

2. Mengubah Nav Sisi Tampilan

Selanjutnya ubah tampilan 

<!DOCTYPE html>
<html lang="en">

<head>
	<?php $this->load->view('_partials/head.php'); ?>
</head>

<body>
	<?php $this->load->view('_partials/navbar.php'); ?>

	<div class="container">
		<h1>Login</h1>
		<p>Masuk ke Dashboard</p>

		<?php if($this->session->flashdata('message_login_error')): ?>
			<div class="invalid-feedback">
					<?= $this->session->flashdata('message_login_error') ?>
			</div>
		<?php endif ?>

		<form action="" method="post" style="max-width: 600px;">
			<div>
				<label for="name">Email/Username*</label>
				<input type="text" name="username" class="<?= form_error('username') ? 'invalid' : '' ?>"
					placeholder="Your username or email" value="<?= set_value('username') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('username') ?>
				</div>
			</div>
			<div>
				<label for="password">Password*</label>
				<input type="password" name="password" class="<?= form_error('password') ? 'invalid' : '' ?>"
					placeholder="Enter your password" value="<?= set_value('password') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('password') ?>
				</div>
			</div>

			<div>
				<input type="submit" class="button button-primary" value="Login">
			</div>
		</form>
	</div>
	<?php $this->load->view('_partials/footer.php'); ?>
</body>

</html>
_7 menjadi seperti ini

$this->session->nama_method_session();
_9

Dalam tampilan ini, kami menggunakan fungsi 

<!DOCTYPE html>
<html lang="en">

<head>
	<?php $this->load->view('_partials/head.php'); ?>
</head>

<body>
	<?php $this->load->view('_partials/navbar.php'); ?>

	<div class="container">
		<h1>Login</h1>
		<p>Masuk ke Dashboard</p>

		<?php if($this->session->flashdata('message_login_error')): ?>
			<div class="invalid-feedback">
					<?= $this->session->flashdata('message_login_error') ?>
			</div>
		<?php endif ?>

		<form action="" method="post" style="max-width: 600px;">
			<div>
				<label for="name">Email/Username*</label>
				<input type="text" name="username" class="<?= form_error('username') ? 'invalid' : '' ?>"
					placeholder="Your username or email" value="<?= set_value('username') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('username') ?>
				</div>
			</div>
			<div>
				<label for="password">Password*</label>
				<input type="password" name="password" class="<?= form_error('password') ? 'invalid' : '' ?>"
					placeholder="Enter your password" value="<?= set_value('password') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('password') ?>
				</div>
			</div>

			<div>
				<input type="submit" class="button button-primary" value="Login">
			</div>
		</form>
	</div>
	<?php $this->load->view('_partials/footer.php'); ?>
</body>

</html>
_8 untuk menampilkan avatar pengguna secara default

Kami belum melakukan fungsi ini

Oleh karena itu, silakan lanjutkan

3. Membuat Pembantu untuk Avatar

Buat file baru di 📁

<!DOCTYPE html>
<html lang="en">

<head>
	<?php $this->load->view('_partials/head.php'); ?>
</head>

<body>
	<?php $this->load->view('_partials/navbar.php'); ?>

	<div class="container">
		<h1>Login</h1>
		<p>Masuk ke Dashboard</p>

		<?php if($this->session->flashdata('message_login_error')): ?>
			<div class="invalid-feedback">
					<?= $this->session->flashdata('message_login_error') ?>
			</div>
		<?php endif ?>

		<form action="" method="post" style="max-width: 600px;">
			<div>
				<label for="name">Email/Username*</label>
				<input type="text" name="username" class="<?= form_error('username') ? 'invalid' : '' ?>"
					placeholder="Your username or email" value="<?= set_value('username') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('username') ?>
				</div>
			</div>
			<div>
				<label for="password">Password*</label>
				<input type="password" name="password" class="<?= form_error('password') ? 'invalid' : '' ?>"
					placeholder="Enter your password" value="<?= set_value('password') ?>" required />
				<div class="invalid-feedback">
					<?= form_error('password') ?>
				</div>
			</div>

			<div>
				<input type="submit" class="button button-primary" value="Login">
			</div>
		</form>
	</div>
	<?php $this->load->view('_partials/footer.php'); ?>
</body>

</html>
9 dengan nama 
<?php

class Dashboard extends CI_Controller
{
	public function __construct()
	{
		parent::__construct();
		$this->load->model('auth_model');
		if(!$this->auth_model->current_user()){
			redirect('auth/login');
		}
	}

	// .. ada kode lain di sini ...
}
0 dan isikan berikut ini

// flash data untuk data sementara
$this->session->set_flashdata('key');
$this->session->flash_data('key');

// user data untuk authenikasi
$this->session->set_userdata('key');
$this->session->userdata('key');
$this->session->has_userdata('key');

// menghapus session
$this->session->unset_userdata('key');
// hapus semua session
$this->session->sess_destory();
0

Fungsi helper ini adalah mengambil gambar dari website 

<?php

class Dashboard extends CI_Controller
{
	public function __construct()
	{
		parent::__construct();
		$this->load->model('auth_model');
		if(!$this->auth_model->current_user()){
			redirect('auth/login');
		}
	}

	// .. ada kode lain di sini ...
}
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