Added error handling, multiple user handling, sess

application/controllers/LoginController.php

@@ -14,11 +14,21 @@ public function admin_login($username, $password) {
 
         // Check the credentials against the users table in the database
         $user = $this->UserModel->get_user_by_username($username);
-        if ($user && password_verify($password, $user['password'])) {
+        if ($user === false) {
+            // The get_user_by_username function failed
+            return array('status' => 'error', 'message' => 'An error occurred');
+        } elseif (count($user) > 1) {
+            // Multiple users with the same username exist in the database
+            return array('status' => 'error', 'message' => 'Multiple users with the same username exist');
+        } elseif (password_verify($password, $user['password'])) {
             // The credentials are correct
+            // Set a session variable with the user's id
+            $this->session->set_userdata('user_id', $user['id']);
             return array('status' => 'success', 'message' => 'Login successful');
         } else {
             // The credentials are incorrect
+            // Log the unsuccessful login attempt
+            $this->log_unsuccessful_login_attempt($username);
             return array('status' => 'error', 'message' => 'Invalid username or password');
         }
     }