How to validate dropdown/selct data

[eluser]Sumon[/eluser]
using a custom validation may be a good choice. by example in form_validation.php add a validation rule

Code:

$this->form_validation->set_rules('sel_sex', 'sex', 'required|callback_check_sex');

and the function check_sex code

Code:

function check_sex()
{
   $valid_selections = array('m','M','f','F');
   $x = $_POST['sel_sex'];
   if(in_array($x , $valid_selections))
   {
     return true;
   }
   else
   {
     $this->form_validation->set_message('check_sex', 'invalid choice');
     return FALSE;
   }
}