public function fooProductQueryBuilder($c_id)
    {
        $qb = $this->createQueryBuilder('p')
                   ->innerJoin('p.ProductCategories', 'pct')
                   ->where('pct.category_id = :category')
                   ->setMaxResults(1) 
                   ->setParameter('category', $c_id);

        return $qb;
    }

    public function foo_product(Application $app, Request $request)
    {
        $tab = array();
        $c_id = [11, 12, 13, 15, 20];

        for($i = 0; $i < 5; $i++){
            $tab[$i] = $app['eccube.repository.product']->fooProductQueryBuilder($c_id[$i])
                          ->getQuery()
                          ->getResult();
        }

        return $app['view']->render("Block/top_product.twig", array(
            "TabProducts" => $tab
        ));
    }

$qb = $this->createQueryBuilder('p')
            ->innerJoin('p.ProductCategories', 'pct')
            ->addSelect('SUM(CASE WHEN pct.Category IN (:category) THEN 1 ELSE 0 END) AS HIDDEN category_count')
            ->having('2 = category_count')
            ->setMaxResults(1)
            ->groupBy('p.id')
            ->setParameter('category', array(126, $c_id));