app/Controllers/Auth/LoginController.php

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+<?php
+
+namespace App\Controllers\Auth;
+
+use App\Controllers\BaseController;
+use App\Models\UserModel;
+
+class LoginController extends BaseController
+{
+    public function showLoginForm()
+    {
+        helper(['form']);
+        echo view('auth/login');
+    }
+
+    public function login()
+    {
+        $email = $this->request->getVar('email');
+        $password = $this->request->getVar('password');
+
+        $user = new UserModel();
+        $data = $user->where('email', $email)->first();
+
+        if ($data) {
+            $pass = $data['password'];
+            $authenticatePassword = password_verify($password, $pass);
+            if ($authenticatePassword) {
+                $authSession = new SessionConroller();
+                $authSession->authorised($data);
+                return redirect()->route('/');
+            } else {
+                $session->setFlashdata('msg', 'Password is incorrect.');
+                return redirect()->back()->withInput();
+            }
+        } else {
+            $session->setFlashdata('msg', 'Email does not exist.');
+            return redirect()->back()->withInput();
+        }
+    }
+
+    public function logout()
+    {
+        $authSession = new SessionConroller();
+        $authSession->unauthorised();
+        return redirect()->route('/');
+    }
+}

app/Controllers/Auth/ProfileController.php

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+<?php
+
+namespace App\Controllers\Auth;
+
+use App\Controllers\BaseController;
+
+class ProfileController extends BaseController
+{
+    public function index()
+    {
+        echo view('auth/profile');
+    }
+}

app/Controllers/Auth/RegisterController.php

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+<?php
+
+namespace App\Controllers\Auth;
+
+use App\Controllers\BaseController;
+use App\Models\UserModel;
+
+class RegisterController extends BaseController
+{
+    public function showRegistrationForm()
+    {
+        helper(['form']);
+        $data = [];
+        echo view('auth/register', $data);
+    }
+
+    public function register()
+    {
+        helper(['form']);
+        $rules = [
+            'name'          => 'required|min_length[2]|max_length[50]',
+            'email'         => 'required|min_length[4]|max_length[100]|valid_email|is_unique[users.email]',
+            'password'      => 'required|min_length[4]|max_length[50]',
+            'confirmpassword'  => 'matches[password]'
+        ];
+
+        if ($this->validate($rules)) {
+            $user = new userModel();
+            $data = [
+                'name'     => $this->request->getVar('name'),
+                'email'    => $this->request->getVar('email'),
+                'password' => password_hash($this->request->getVar('password'), PASSWORD_DEFAULT)
+            ];
+
+            $user->save($data);
+            $authSession = new SessionConroller();
+            $authSession->authorised($data);
+
+            return redirect()->to('/');
+        } else {
+            $data['validation'] = $this->validator;
+            echo view('auth/register', $data);
+        }
+    }
+}

app/Controllers/Auth/SessionConroller.php

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+<?php
+
+namespace App\Controllers\Auth;
+
+use App\Controllers\BaseController;
+
+class SessionConroller extends BaseController
+{
+    public function authorised($data)
+    {
+        $session = session();
+        $authData = [
+            'name' => $data['name'],
+            'email' => $data['email'],
+            'isLoggedIn' => true
+        ];
+
+        $session->set($authData);
+    }
+
+    public function unauthorised()
+    {
+        $session = session();
+        $authData = ['isLoggedIn' => false];
+
+        $session->set($authData);
+    }
+}

app/Controllers/BaseController.php

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+<?php
+
+namespace App\Controllers;
+
+use CodeIgniter\Controller;
+use CodeIgniter\HTTP\CLIRequest;
+use CodeIgniter\HTTP\IncomingRequest;
+use CodeIgniter\HTTP\RequestInterface;
+use CodeIgniter\HTTP\ResponseInterface;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Class BaseController
+ *
+ * BaseController provides a convenient place for loading components
+ * and performing functions that are needed by all your controllers.
+ * Extend this class in any new controllers:
+ *     class Home extends BaseController
+ *
+ * For security be sure to declare any new methods as protected or private.
+ */
+abstract class BaseController extends Controller
+{
+    /**
+     * Instance of the main Request object.
+     *
+     * @var CLIRequest|IncomingRequest
+     */
+    protected $request;
+
+    /**
+     * An array of helpers to be loaded automatically upon
+     * class instantiation. These helpers will be available
+     * to all other controllers that extend BaseController.
+     *
+     * @var array
+     */
+    protected $helpers = [];
+
+    /**
+     * Constructor.
+     */
+    public function initController(RequestInterface $request, ResponseInterface $response, LoggerInterface $logger)
+    {
+        // Do Not Edit This Line
+        parent::initController($request, $response, $logger);
+
+        // Preload any models, libraries, etc, here.
+
+        // E.g.: $this->session = \Config\Services::session();
+    }
+}

app/Controllers/Home.php

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+<?php
+
+namespace App\Controllers;
+
+class Home extends BaseController
+{
+    public function index()
+    {
+        $session = session();
+
+        $data = [
+            'name' => $session->get('name'),
+            'email' => $session->get('email'),
+            'authorised' => $session->get('isLoggedIn'),
+        ];
+
+        return view('home', $data);
+    }
+}