您还需要绑定couponCode。
if ($couponCode == $coupons_db3['coupon_code']){
echo $couponCode;
$stmt = $db->prepare('UPDATE promocode_3 SET used = 1 WHERE coupon_code =:couponCode');
$stmt->bindValue(':couponCode', $couponCode, PDO::PARAM_STR);
$stmt->execute();
$stmt = $db->prepare('UPDATE usr_customer_profile SET packageid = 3 WHERE usrcustomerid = :usrcustomerid');
$stmt->bindValue(':usrcustomerid', $_SESSION['usrcustomerid'], PDO::PARAM_INT);
$stmt->execute();
break;
}
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