[ivantcholakov]

@dbui

I use the same approach, a callback wrapper within the controller with a tiny difference (tried on CI3):

Code:

$this->form_validation->set_rules('email', "email",'callback_validate_user');

In my code it would be:

Code:

$this->form_validation->set_rules('email', "email",'callback__validate_user');

And:

Code:

public function validate_user($str) {

would be:

Code:

public function _validate_user($str) {

Ugly a little bit, but this prefixed with "_" callback rule can not be called by the router.