Codeigniter form validation - at least one field is required

Question

I have a submit form with 3 fields. At least one of the field should be filled in before submitting. Could you please help me to do it with codeigniter form validation.

controller

$this->form_validation->set_rules('country', 'Country','trim|strip_tags');
$this->form_validation->set_rules('state','State','trim|strip_tags');
$this->form_validation->set_rules('city','City','trimstrip_tags');

Answer 1

Not a guru, but that will be my approach...

function do_add()
{
   if( (isset($_POST['country']) || (isset($_POST['state']) || (isset($_POST['city']) )
   {
      //Do stuff
   }
   else
   {
      //Redirect or whatever
   }
}