<?php





class Adress

{

   public $value;

   

   public function __construct($value)

   {

       $this->value = $value;

   }

}



class Person

{

   public $adress;

}



$adress = new Adress('44 route de la mairie');

$bob = new Person();

$jeanne = new Person();



$bob->adress = $adress;

$jeanne->adress = $bob->adress;



$bob->adress->value = '5 Rue de Jean Bobine';



echo $jeanne->adress->value;

// 5 Rue de Jean Bobine