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CodeIgniter 4 Architecture & Syntax Cheat Sheet
Quick reference guide for Models, Query Builder, Route groups, Filters, and CSRF protection in CodeIgniter 4.
Routes & Filters
app/Config/Routes.php
$routes->group('student', ['filter' => 'auth'], static function ($routes) {
$routes->get('dashboard', 'Student\DashboardController::index');
$routes->get('course/(:segment)', 'Student\PlayerController::play/$1');
});
Query Builder (Fluent SQL)
Model / Controller
$users = $db->table('users')
->select('users.*, subscriptions.status as sub_status')
->join('subscriptions', 'subscriptions.user_id = users.id', 'left')
->where('users.role', 'student')
->orderBy('users.id', 'DESC')
->limit(20)
->get()
->getResultArray();
CSRF Token Form
Views
<form action="<?= base_url('submit') ?>" method="POST">
<?= csrf_field() ?>
<input type="text" name="name" required>
<button type="submit">Submit</button>
</form>
Model Structure
app/Models/UserModel.php
class UserModel extends Model {
protected $table = 'users';
protected $primaryKey = 'id';
protected $allowedFields = ['name', 'email', 'password', 'role', 'status'];
protected $useTimestamps = true;
protected $dateFormat = 'datetime';
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