3 задача (2 вариант с формами html)

Список задач по ООП

class Worker {
  private $name;
  private $nametwo;
  private $age;
  private $agetwo;
  private $salary;
  private $salarytwo;
  public function setName () {}
  public function getName () {}
  public function setAge () {
    $a = new Worker;
    $a->checkAge ();  
  }   
  public function getAge () {}
  public function setSalary () {}
  private function checkAge () {
    if (isset($_POST['age']))
      {
       $a = $_POST['age'];  
       if (($a>0) and ($a<100)) {
         $human_age_1 =$a;     
         $human_age_2 = $this -> age = 26;
         echo "Vozrast pervogo: ",  $human_age_1;
         echo "<BR>";
         echo "Vozrast vtorogo: ",  $human_age_2;
         echo "<BR>";
     }
     else  {
         echo "OSHIBKA! ESHE RAZ VVEDITE";
         return;
     }
    }
}
}
 
$a = new Worker;
 $a->setAge ();
?>
  <form action="q.php" method="post">
    <p>Возраст человека : <input type="text" name="age" /> 
    <input type="submit" /></p>
  </form>
</body>
</html>