if (!comprova_auth()) {
    header("Location: practica_php.php");
}
$form = new Formulari();
$results = array('success' => false, 'llista' => null, 'mess' => null);
$accessoris = "";
$codi = $form->crearElement("codi_vehicle");
$codi->setTipus("numeric");
$codi->setRestriccio(false);
if (count($_POST)) {
    if ($form->valida($_POST)) {
        $id = $codi->getValor();
        /*recuperar model del vehicle*/
        //$vehicle = new Vehicle();
        $vehicle = new Vehicle($id);
        $dades = $vehicle->obtenirDades();
        $model = $dades->MODEL_CODI;
        /* recuperar llista accessoris del model*/
        include_once $dir . "/../classes/Llistes/LlistaAccesoris.php";
        $accessoris = new LlistaAccesoris();
        $llista = array();
        $i = 0;
        foreach ($accessoris->getAccessorisByModel($model) as $a) {
            $llista[$i]['codi'] = $a->CODI;
            $llista[$i]['descripcio'] = $a->DESC;
            $i++;
        }
        $results['success'] = true;
        $results['llista'] = $llista;
    }
}