<?php

class Personne {

    public $nom;
    public $prenom;
    public $adresse;
    public $dateNaissance;

    public function __construct($nom, $prenom, $adresse, $dateNaissance)
    {
        $this->nom = $nom;
        $this->prenom = $prenom;
        $this->adresse = $adresse;
        $this->dateNaissance = $dateNaissance;
    }

    public function description ()
    {
        echo "Bonjour je m'appelle " . $this->prenom . " " . $this->nom . ", j'habite à " . $this->adresse . " et je suis né le " . $this->dateNaissance . ".";
    }

    public function modifierAdresse($nouvelleAdresse)
    {
        $this->adresse = $nouvelleAdresse;
    }

    public function afficherAge(){
        $date = $this->dateNaissance;
        $date = preg_replace("/\//", " ", $date);
        $date = explode(" ", $date);
        $age = date("Y") - $date[2];
        if((date("m") - $date[1])< 0){
            $age -= 1;
        }
        echo "J'ai $age ans";
    }
}

$john = new Personne("Doe", "John", "Nantes", "29/12/1994");

$john->description();
echo "<br>";
$john->modifierAdresse("Paris");
$john->description();
echo "<br>";
$john->afficherAge();