Codeigniter validation--how to limit numerical value?

Question

I simply need to add a validation class that limits a numerical entry from being greater than 24.

Is this possible with CI's default validation classes or will I have to write a custom validation class?

Answer 1

Sure you can, just make your own validation function and add it as a callback to validation rule. See http://codeigniter.com/user_guide/libraries/form_validation.html#callbacks

Hence, you will have

...
$this->form_validation->set_rules('mynumber', 'This field', 'callback_numcheck');
....
function numcheck($in) {
  if (intval($in) > 24) {
   $this->form_validation->set_message('numcheck', 'Larger than 24');
   return FALSE;
  } else {
   return TRUE;
  }
}

Answer 2

There's no maximum or minimum comparison function in the Form Validation Rule Reference, so you can just write your own validation function.

It's pretty straightforward. Something like this should work:

function maximumCheck($num)
{
    if ($num > 24)
    {
        $this->form_validation->set_message(
                        'your_number_field',
                        'The %s field must be less than 24'
                    );
        return FALSE;
    }
    else
    {
        return TRUE;
    }
}


$this->form_validation->set_rules(
        'your_number_field', 'Your Number', 'callback_maximumCheck'
    );