Mam zrobiony taki koszyk na stronie. Jak za pomocą przycisku dodaj albo usuń zwiększać i zmniejszać ilość produktów?
<div class="product">
<img class="product__image" src="img/products/beer.svg" alt="Beer">
<h2 class="product__name">Beer</h2>
<h3 class="product__price">6.00</h3>
<a href="index.php?action=addToCart&productID=Beer&amount=1"><button class="btn btn--primary" data-action="ADD_TO_CART">Add To Cart</button></a>
</div>
<div class="product">
<img class="product__image" src="img/products/energy-drink.svg" alt="Energy Drink">
<h2 class="product__name">Energy Drink</h2>
<h3 class="product__price">5.00</h3>
<a href="index.php?action=addToCart&productID=Energy Drink&amount=1"><button class="btn btn--primary" data-action="ADD_TO_CART">Add To Cart</button></a>
</div>
$button="<input type='submit' value='add' style='width:50px;' />";
$delete="<input type='submit' value='delete' style='width:50px;' />";
if(isset($_GET['action'])){
@$_SESSION['produkty']=$_SESSION['produkty']." ".$_GET['productID']." ".$_GET['amount'].$button.$delete.'<br>';
unset($_GET['action']);
echo $_SESSION['produkty'];
echo "<a href='summary.php' style='text-decoration:none;'> <input type='submit' value='proceed to payment'/> </a>";
}