combo box

This is my revision but I still get strange result:

PHP Code:

public function add_user()
    {    
            
        $data = array(
            'username' => $this->input->post('username'),
            'email' => $this->input->post('email'),
            'password' => $this->input->post('password'),
            'role' => form_dropdown('roles', $options, 'administrator')        
        );        
        
        return $this->db->insert('login', $data);
        
    } 


username            email                   password             role

user                    [email protected]    12345678           <select name="roles"

" If I looks more intelligence please increase my reputation."