using $_post in function

[eluser]trevor2[/eluser]
This works, thanks everyone.

Code:

function username_check($username)
        {
            $this->load->database();
            
            $query = $this->db->query("SELECT username FROM ci_members WHERE username = '$username'");
            
            if($query->num_rows() > 0)
            {
                $this->form_validation->set_message('username_check', 'Please choose another name');
                return FALSE;
            }
            else
            {
                return $username;
            }
        }