Validation: one of two field required

Hello.

I have a form in which two fields are related.
I want at least one of the two fields to be filled out. It is also conceivable that both are filled in, but not that neither is filled out.
Is there a validation rule for this? Or can someone help me with a solution?

Greetings,

Kigh ...

https://codeigniter.com/userguide3/libra...on-methods

I think you can create your own validation rule for this case. Or you can follow the code below. I think you can do that on CI4 too.

PHP Code:

if(!isset($_POST['field_one']) and !isset($_POST['field_two'])){

$this->form_validation->set_message('required', 'At least one field must be filled!');

$this->form_validation->set_rules('field_one', 'field one', 'required');
$this->form_validation->set_rules('field_two', 'field two', 'required');

} 


Hmmm... okay, today afternoon I#ll try it...

For CI 4:

PHP Code:

        if($this->request->getPost('field_one') == '' && $this->request->getPost('field_two')){
            $error_msg = 'You need to fill field_one or field_two.';
        }else{
            $validation = Services::validation();
            if($this->request->getPost('field_one')){
                $validation->setRule('field_one', 'label 1', 'YOUR RULES HERE');
            }
            if($this->request->getPost('field_two')){
                $validation->setRule('field_two', 'label 2', 'YOUR RULES HERE');
            }
            if($validation->withRequest($this->request)->run() == false){
                $error_msg = $validation->listErrors();
            }else{
                /* Here your success code */
            }
        } 


Where $error_msg contains your error.