Codeigniter

CodeIgniter Development

You are a CodeIgniter expert. You work with both CI3 (3.1.x) and CI4 (4.x, latest stable 4.7.x) and understand their fundamental architectural differences. Always identify which version the project uses before writing any code.

For deep dives on version-specific features, see:

• [CI3 deep dive](references/ci3.md) — file uploads, email, caching, pagination, libraries, HMVC, hooks, helpers, logging
• [CI4 deep dive](references/ci4.md) — REST controllers, entities, filters, migrations, seeders, uploads, email, caching, services, events, views, cells, Spark CLI, testing, Shield auth, content negotiation
• [Deployment & migration](references/deployment.md) — server config, production checklist, full CI3→CI4 migration table

Version Detection

| Signal | Version | |--------|---------| | system/core/CodeIgniter.php exists | CI3 | | $this->load->model() / $this->load->view() | CI3 | | application/config/config.php | CI3 | | app/Config/App.php exists | CI4 | | namespace App\Controllers; in controllers | CI4 | | spark CLI at project root | CI4 | | composer.json requires codeigniter4/framework | CI4 |

---

CI3 — Core Patterns

Project Structure

project/
├── application/
│   ├── config/        # autoload.php, config.php, database.php, routes.php, hooks.php
│   ├── controllers/
│   ├── models/
│   ├── views/
│   ├── libraries/
│   ├── helpers/
│   ├── hooks/
│   ├── core/          # MY_Controller, MY_Model overrides
│   └── third_party/
├── system/            # framework core — never edit
└── index.php          # front controller

Controllers

load->model('product_model');
        $this->load->helper('url');
    }

    public function index()
    {
        $data['products'] = $this->product_model->get_all();
        $this->load->view('products/index', $data);
    }

    public function view($id)
    {
        $data['product'] = $this->product_model->get($id);
        if (empty($data['product'])) {
            show_404();
        }
        $this->load->view('products/view', $data);
    }
}

Rules: Class name MUST match filename (first letter uppercase). Always call parent::__construct(). On Linux, filenames are case-sensitive.

Models

db->get($this->table)->result();
    }

    public function get($id)
    {
        return $this->db->get_where($this->table, ['id' => $id])->row();
    }

    public function insert($data)
    {
        $this->db->insert($this->table, $data);
        return $this->db->insert_id();
    }

    public function update($id, $data)
    {
        $this->db->where('id', $id);
        return $this->db->update($this->table, $data);
    }

    public function delete($id)
    {
        return $this->db->delete($this->table, ['id' => $id]);
    }
}

Query Builder

// SELECT with chaining
$results = $this->db
    ->select('p.*, c.name as category_name')
    ->from('products p')
    ->join('categories c', 'c.id = p.category_id', 'left')
    ->where('p.active', 1)
    ->where('p.price >', 10)
    ->order_by('p.name', 'ASC')
    ->limit(20, $offset)
    ->get()
    ->result();

// INSERT / UPDATE / DELETE
$this->db->insert('products', ['name' => $name, 'price' => $price]);
$this->db->where('id', $id)->update('products', ['price' => $new_price]);
$this->db->where('id', $id)->delete('products');

// Transactions
$this->db->trans_start();
$this->db->insert('orders', $order_data);
$this->db->insert('order_items', $item_data);
$this->db->trans_complete();
if ($this->db->trans_status() === FALSE) { /* failed */ }

// Raw query (always bind params)
$this->db->query('SELECT * FROM products WHERE slug = ?', [$slug]);

Routing

$route['default_controller'] = 'home';
$route['404_override'] = 'errors/page_missing';
$route['products'] = 'catalog/index';
$route['products/(:num)'] = 'catalog/view/$1';
$route['api/products/(:any)'] = 'api/products/$1';

Input & Security

// ALWAYS use $this->input — never raw $_POST/$_GET
$name = $this->input->post('name', TRUE);  // TRUE = XSS filter
$id   = $this->input->get('id');

// CSRF — enable in config.php
$config['csrf_protection'] = TRUE;

// Output escaping in views

Form Validation

$this->load->library('form_validation');
$this->form_validation->set_rules('name', 'Name', 'required|min_length[3]|max_length[255]');
$this->form_validation->set_rules('email', 'Email', 'required|valid_email|is_unique[users.email]');

if ($this->form_validation->run() === FALSE) {
    $this->load->view('form', $data);
} else {
    $this->product_model->insert($this->input->post());
    redirect('products');
}

Sessions

$this->session->set_userdata('user_id', $id);
$user_id = $this->session->userdata('user_id');
$this->session->set_flashdata('success', 'Product created.');

---

CI4 — Core Patterns

Project Structure

project/
├── app/
│   ├── Config/        # App.php, Database.php, Routes.php, Filters.php, Services.php, Events.php
│   ├── Controllers/   # BaseController.php
│   ├── Models/
│   ├── Views/
│   ├── Filters/
│   ├── Entities/
│   ├── Cells/
│   ├── Commands/
│   ├── Database/      # Migrations/, Seeds/
│   └── Language/
├── public/            # web root — point server here
│   └── index.php
├── writable/          # cache, logs, session — must be writable by web server
├── tests/
├── .env
├── spark              # CLI tool
└── composer.json

Controllers

 $model->findAll()]);
    }

    public function show($id = null)
    {
        $product = model('ProductModel')->find($id);
        if ($product === null) {
            throw \CodeIgniter\Exceptions\PageNotFoundException::forPageNotFound();
        }
        return view('products/show', ['product' => $product]);
    }

    public function create()
    {
        if (! $this->validate([
            'name'  => 'required|min_length[3]|max_length[255]',
            'price' => 'required|numeric|greater_than[0]',
        ])) {
            return view('products/create', ['validation' => $this->validator]);
        }
        model('ProductModel')->insert($this->request->getPost());
        return redirect()->to('/products')->with('success', 'Product created.');
    }
}

Models

 'required|min_length[3]|max_length[255]',
        'price' => 'required|numeric|greater_than[0]',
    ];
}

Critical: $allowedFields is mandatory — fields not listed are silently dropped on insert/update. This prevents mass assignment.

Query Builder

$db = db_connect();

// SELECT with joins + pagination
$model = model('ProductModel');
$data = [
    'products' => $model->where('active', 1)->paginate(20),
    'pager'    => $model->pager,
];

// Raw builder
$results = $db->table('products')
    ->select('products.*, categories.name as category')
    ->join('categories', 'categories.id = products.category_id', 'left')
    ->where('products.active', 1)
    ->orderBy('products.name', 'ASC')
    ->get()
    ->getResultArray();

// Transactions
$db->transStart();
$db->table('orders')->insert($order_data);
$db->table('order_items')->insert($item_data);
$db->transComplete();
if (! $db->transStatus()) { /* failed */ }

Routing

$routes->get('/', 'Home::index');
$routes->get('products', 'Products::index');
$routes->get('products/(:num)', 'Products::show/$1');
$routes->post('products', 'Products::create');
$routes->resource('products'); // generates all CRUD routes

$routes->group('api', ['namespace' => 'App\Controllers\Api', 'filter' => 'apiauth'], function ($routes) {
    $routes->resource('products');
});

$routes->get('admin/(:any)', 'Admin::$1', ['filter' => 'auth']);

Input & Security

// ALWAYS use $this->request — never raw $_POST/$_GET
$name = $this->request->getPost('name');
$id   = $this->request->getGet('id');
$data = $this->request->getJSON(true); // JSON API bodies → array

// Output escaping in views — context-aware

Sessions

$session = session();
$session->set('user_id', $id);
$userId = $session->get('user_id');
$session->setFlashdata('success', 'Done.');
$session->setTempdata('otp', $code, 300); // auto-expires in 5 minutes

---

Security Checklist (Both Versions)

• [ ] Never use raw $_POST/$_GET — use input class (CI3) or $this->request (CI4)
• [ ] Enable CSRF protection; exempt only stateless API endpoints
• [ ] Use query builder or bound parameters — never concatenate SQL
• [ ] Escape output: html_escape() (CI3) or esc() (CI4) in views
• [ ] Set db_debug = FALSE (CI3) / CI_ENVIRONMENT = production (CI4) on prod
• [ ] Keep system/ (CI3) or project root (CI4) outside web root
• [ ] Use $allowedFields in CI4 models to prevent mass assignment
• [ ] Validate file uploads — check MIME type, not just extension
• [ ] Set secure session config: database driver, httponly, secure flags
• [ ] Use esc($var, 'attr') for HTML attributes, esc($var, 'js') for JS contexts
• [ ] Set Content-Security-Policy headers for production
• [ ] Use HTTPS everywhere — app.forceGlobalSecureRequests = true in CI4
• [ ] Never expose stack traces in production

---

CI3 → CI4 Quick Reference

| CI3 | CI4 | |-----|-----| | $this->load->model('x') | model('XModel') or DI | | $this->load->view('x', $data) | return view('x', $data) | | $this->load->library('x') | service('x') or new X() | | $this->input->post('x') | $this->request->getPost('x') | | $this->db->get('table') | $db->table('table')->get() | | $query->result() / ->row() | $query->getResult() / ->getRow() | | $query->result_array() | $query->getResultArray() | | redirect('url') | return redirect()->to('url') | | show_404() | throw PageNotFoundException::forPageNotFound() | | $this->session->userdata('x') | session()->get('x') | | html_escape($x) | esc($x) | | $route['x'] = 'y' | $routes->get('x', 'Y::method') | | Hooks ($hook[]) | Filters (middleware) | | CI_Controller / CI_Model | BaseController / CodeIgniter\Model | | No namespaces | PSR-4 namespaces | | No CLI generator | php spark make:* |

See [deployment.md](references/deployment.md) for the full 30+ mapping migration table, server configuration, and production deployment checklist.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: yasserstudio
• Source: yasserstudio/codeigniter-skills
• License: MIT
• Homepage: https://github.com/yasserstudio/codeigniter-skills/releases/latest

Install and usage instructions live in the source repository linked above.