If condition not working with CodeIgniter validation -

i'm using codeigniter! have 3 radio buttons - choose role. if choose 1 of 3 radio buttons, see different dropdowns. want make validation rules - echo validation errors on these dropdowns radio button have chosen. tried doesn't show me validation errors. first, radio buttons are:

 <input type="radio"   name="role_id[]" onclick='showhide(this, true)' id="radio1"  value="1" />          $data=array(      'name' => 'role_id[]',      'value' => '2',       'id' => 'radio2',      'onclick' => 'showhide(this, true)'      );    echo form_radio($data);      $data=array(      'name' => 'role_id[]',      'value' => '5',      'id' => 'radio5',   'onclick' => 'teachers_show(this, true)'      );    echo form_radio($data);

my controller is:

 public function register()      {        ​   if ($this->input->post('role_id[]') === 1){          $this->form_validation->set_rules('first_name', first name', 'trim|required');          $this->form_validation->set_rules('last_name', 'last name', 'trim|required');           $this->form_validation->set_rules('username', 'username', 'trim|required|min_length[6]|max_length[12]|is_unique[users.username]');          $this->form_validation->set_rules('password', 'password', 'trim|required|min_length[6]');           $this->form_validation->set_rules('password2', 'confirm password', 'trim|required|matches[password]');            $this->form_validation->set_rules('email', 'email', 'trim|required|valid_email|is_unique[users.email]');          $this->form_validation->set_rules('location', 'location', 'trim|required');          $this->form_validation->set_rules('school[]', 'school', 'required');          $this->form_validation->set_rules('class[]', 'class', 'required');          $this->form_validation->set_rules('role_id[]', 'role', 'required');          $this->form_validation->set_rules('class_divisions[]', 'class division', 'required');          $this->form_validation->set_rules('region', 'region', 'required');          $this->form_validation->set_rules('teacher[]', 'teacher', 'required');                    }       ​   elseif ($this->input->post('role_id[]') === 2){          $this->form_validation->set_rules('first_name', first name', 'trim|required');          $this->form_validation->set_rules('last_name', 'last name', 'trim|required');           $this->form_validation->set_rules('username', 'username', 'trim|required|min_length[6]|max_length[12]|is_unique[users.username]');          $this->form_validation->set_rules('password', 'password', 'trim|required|min_length[6]');           $this->form_validation->set_rules('password2', 'confirm password', 'trim|required|matches[password]');            $this->form_validation->set_rules('email', 'email', 'trim|required|valid_email|is_unique[users.email]');          $this->form_validation->set_rules('location', 'location', 'trim|required');          $this->form_validation->set_rules('school[]', 'school', 'required');          $this->form_validation->set_rules('class[]', 'class', 'required');          $this->form_validation->set_rules('role_id[]', 'role', 'required');          $this->form_validation->set_rules('class_divisions[]', 'class division', 'required');          $this->form_validation->set_rules('region', 'region', 'required');                            }           elseif ($this->input->post('role_id[]') === 5 ){              $this->form_validation->set_rules('all_teachers_show', 'all teachers', 'required');            }          if ($this->form_validation->run()==false)          {              $this->signup();          }          else           {  ​  //register  }  }

if use this:

  if ($this->input->post('role_id[]') < 2){​             // validation rules       }           if ($this->input->post('role_id[]') >4 ){​             // validation rules       }

it shows me validation errors role_id=1. role_id=5 shows me validation errors role_id=1. me? :) thanks!

you passing string 'value' => '2' , trying compare if identical === integer 2 evaluate false. cast input specified integer , see have got after. i.e. (int)$this->input->post('role_id[]') === 2.

public function radiobutton() {     echo form_open('test/passingthrough');     echo '<input type="radio" name="myradio" value="1" ' . set_radio('myradio', '1', true) . ' />';     echo '<input type="radio" name="myradio" value="2" ' . set_radio('myradio', '2') . ' />';     echo '<input type="radio" name="myradio" value="5" ' . set_radio('myradio', '5') . ' />';     echo form_submit('mysubmit', 'submit radio button!'); }  public function passingthrough() {     $this->form_validation->set_rules('mysubmit', '', 'required');     $this->form_validation->set_rules('myradio', '', 'required');      if ($this->form_validation->run() == false) {         redirect('test/radiobutton', 'refresh');     } else {         echo '<pre>', var_dump($this->input->post('myradio'));     } } 

in example passed value (and since radio, there 1 passed value sure) looking for. also, if right, need null, false or ever value non passed values. have array of values in action controller or model, , check in foreach loop it:

$possible_values = array(1, 2, 5); foreach ($possible_values $p_v) {     if ($this->input->post('role_id') == $p_v) {         //do want true 'role_id'     } else {         //do want false 'role_id'     } }