<?php

class User
{
    private static $nombre_user = 0;

    private $nom, $address, $telephone;

    public $age;

    public function __construct()
    {
        self::incrementUserCount();
    }

    private static function incrementUserCount()
    {
        self::$nombre_user += 1;
    }

    public static function getNbUser()
    {
        return self::$nombre_user;
    }

    public function getAddress()
    {
        return $this->address;
    }

    public function setAddress($address)
    {
        $this->address = $address;
    }

    public function getTelephone()
    {
        return $this->telephone;
    }

    public function setTelephone($telephone)
    {
        $this->telephone = $telephone;
    }

    public function setNom($nouveau_nom)
    {
        $this->nom = $nouveau_nom;
    }

    public function getNom()
    {
        return $this->nom;
    }
}

echo User::getNbUser();

$blaireau = new User();
echo User::getNbUser();

$bogoss = new User();
echo User::getNbUser();

$blaireau->setNom("cantin");
$bogoss->setNom("nicolas");

echo $blaireau->getNom();


echo $bogoss->getNom();