<?php
    class Etudiant {
        private $nom;
        private $prenom;
        private $age;

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

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

        public function getPrenom() {
            return $this->prenom;
        }

        public function getAge() {
            return $this->age;
        }

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

        public function setPrenom($prenom) {
            $this->prenom = $prenom;
        }

        public function setAge($age) {
            if ($age > 0) {
                $this->age = $age;
            } else {
                throw new Exception("L'âge doit être un nombre positif.");
            }
        }

        public function afficherInfo() {
            return "Nom: " . $this->nom . ", Prénom: " . $this->prenom . ", Âge: " . $this->age;
        }
    }