<?php
  class Etudiant{
    public $nom;
    public $prenom;
    public $annee;
    private $age;
    
    public function __construct($n,$p,$a,$an){
       $this->nom=$n;
       $this->prenom=$p;
       $this->age=$a;
       $this->annee=$an;
    }

    public function toJSON(){
      foreach($this as $name=>$value){
         $res[$name]=$value;
      }
      return json_encode($res);
    }

  }
?>