Usage Changes of Validation Callback

[abydahana]

When you using a native form validation without Aksara renderer, you may need a custom validation callback. Since the validation callback has changed, you couldn't using string validation (usually using callback_ prefix) anymore to call your own validation function.

Instead, below is a working sample of replacement:

$this->form_validation->setRule('field_name', 'Field Label', ['required', 'integer', static function ($value, $data, &$error, $field) {
        if ((int) $value % 2 !== 0) {
            $error = 'The value is not even.';

            return false;
        }

        return true;
    }
]);

You can still use multiple rules and the rules must be typed as array when you using the callback validation.

[abydahana]

Or use shortest method:

...
$this->form_validation->setRule('field_name', 'Field Label', ['required', [$this, 'function_name']]);
...
...
public function function_name($value)
{
    if ($value !== 1) {
        $this->form_validation->setError('field', 'The field label must be equal to 1');
    }

    return true;
}