Problème PHP

        $achat = Securise($_GET['achat']);
        if($achat == "fanperso")
        {
            if($user['point'] >= 0)
            {
                $sql =
                $stock2 = mysql_query("SELECT * FROM stock WHERE utilise = '0' LIMIT 1");
                $stock = mysql_fetch_array($stock2);
                $row = mysql_fetch_assoc($test);
                $test = mysql_query("SELECT * FROM service_fansite WHERE username=".$user['username']." LIMIT 1");
                mysql_query("INSERT INTO transaction (username,quoi,quand) VALUES ('".$user['username']."','commande service FanSite Grauit ','".FullDate('full')."')");
                mysql_query("INSERT INTO service_fansite (username,service,valable,fin,domaine,acces_utilisateur,acces_mdp,hote,statut) VALUES ('".$user['username']."','FanSite Gratuit','1 mois','".FullDate('default')."','En cours','Pro seulement','Pro seulement','Pro seulement','1')") or die (mysql_error());
                mysql_query("DELETE FROM stock WHERE id = '".$stock['id']."' LIMIT 1");
                        header('Location: sitefan?achat=ok');
            }
                else
            {
                if(mysql_num_rows($test) > 0) {
                header('Location: sitefan?achat=non');
            }
        }
        }

                        if(isset($_GET['achat']))
    {
        $achat = Securise($_GET['achat']);
        if($achat == "ok") { $message = '
                        <div class="alert alert-dismissible alert-success">
                 <button type="button" class="close" data-dismiss="alert">×</button>
                <strong><center>Bravo! votre service viens d\'être commandé.</center></strong>
                </div>
        '; }
        elseif ($achat == "non") { $message = '
                        <div class="alert alert-dismissible alert-danger">
                 <button type="button" class="close" data-dismiss="alert">×</button>
                <strong><center>Vous n\'avez pas assez de points. <a href="recharge">clic ici</a> pour en acheter</center></strong>
                </div>
        '; }
        elseif(empty($achat)) { header('Location:./sitefan'); }
    }