Form Validation in CodeIgniter

Form Validation in CodeIgniter — a practical guide to CodeIgniter form validation with clear examples you can reuse in real projects.

CodeIgniter Tutorial Series (24/74). Prefer one article? Read the complete CodeIgniter tutorial.

Short description

Define rules, run validation, and redisplay the form with errors and old input on failure.

Validate in controller

$rules = [
    'email' => 'required|valid_email',
    'password' => 'required|min_length[8]',
];

if (! $this->validate($rules)) {
    return view('auth/login', [
        'validation' => $this->validator,
    ]);
}