public function log_in()
    {
        $emailadres = $this->input->post('email');
        $wachtwoord = ($this->input->post('password'));

        $result = $this->user_model->login($emailadres, $wachtwoord);

        if ($result[0]->role_id == 1) {
            $this->user_model->add_login();
            $this->log();
            redirect('admin/welcome_admin', 'refresh');
        }
        if ($result[0]->role_id == 2) {
            $this->user_model->add_login();
            $this->log();
            redirect('manager/welcome_manager', 'refresh');
        }
        if ($result[0]->role_id == 3) {
            $this->user_model->add_login();
            $this->log();
            redirect('edumed/welcome_edumed', 'refresh');
        }
        if ($result[0]->role_id == 4) {
            $this->user_model->add_login();
            $this->log();
            redirect('salesman/welcome_salesman', 'refresh');
        } else {
            $this->user_model->add_login_attempt();
            $this->log();
            echo "Login mislukt, probeer opnieuw";
            $this->login();
        }
    }