class Prof {
  public function modifCours($name, $desc, $student, $time) {
    //Code de modif de cours
  }
}

class Modo {
  public function modifCours($name, $desc, $student, $time) {
    //On appel la méthode du prof pour modif les cours
	Prof::modifcours($name, $desc, $student, $time);
  }

  public function changeLvl(int $id_membre, int $level) {
	if (!$this->_checkLevel($level) {
      throw new Exception('Level ' . $level . ' isn't correct!');
    }
    //Code
  }

  private function _checkLevel($level) {
    if ($level < 2 || $level > 3)
      return false;
    return true;
  }
}

class Admin extends Modo {
  public function checkAccess($id_membre) {
    //Code
  }

  private function _checkLevel($level) {
    if ($level < 0 || $level > 3)
      return false;
    return true;
  }
}