How to apply only valid coupon codes to shopping cart programmatically?

Question

I have a number of coupon codes which i want to apply to the cart programmatically.

I have done it like this:

foreach ($coupons as $coupon) //$coupons array of coupon codes
{
    Mage::getSingleton('checkout/cart')
        ->getQuote()
        ->setCouponCode($coupon)
        ->collectTotals()
        ->save();
}

Now what happens is that if the first coupon is valid, it got applied, but after that

• if the second coupon is valid, it got replaced (first removed, second applied).
• if the second coupon is not valid it removes the discount applied by the first coupon too.

Now I need help to tackle the situation as how to be able to apply both coupon/rules/discounts if valid (if possible applying two coupon codes)? or not apply coupon code if not valid so that the coupon applied before doesn't got removed.

Answer 1

As per as magento system,you cannot apply multiple coupon on a cart.

If you want then need to use

3rd partly extension like amasty

Or

you can use this answer:

Magento Multiple coupon apply on cart