public function ajoutez_un(Panier $panier)
{
$maquantite = $panier->getQuantiteart();
$plusun = 1;
$requete = $this->_db->prepare('update panier set quantiteart=:quantiteart where id=:id');
$requete->execute(array(':quantiteart' => $maquantite + $plusun, ':id' => $panier->getIdpanier()));
}
<?php
/**
* Created by PhpStorm.
* User: Florent
* Date: 12/03/2015
* Time: 08:48
*/
require_once '../bdd/pdo.php';
require_once '../class/Article.php';
require_once '../manager/ArticleManager.php';
require_once '../manager/PanierManager.php';
require_once '../class/Panier.php';
session_start();
$monpanier = new Panier();
$monpaniermanager = new PanierManager($bdd);
$id = $_POST['idpanier1'];
$quantite = $_POST['quantitepanier'];
$monpanier->setIdpanier($id);
$monpanier->setQuantiteart($quantite);
if ($monpanier->getQuantiteart() == 1) {
$monpaniermanager->suppression_panier_ligne($monpanier);
header('Location:../main/panier.php');
} else {
$monpaniermanager->soustraction_un($monpanier);
header('Location:../main/panier.php');
}