php shopping cart add delete

When shopping online, have you ever encountered such a problem: you added an item, but when you confirmed the purchase, you found that it was not what you really wanted, or a certain item was sold out and you needed to remove it from the shopping cart delete. At this time, the add and delete functions of the shopping cart are very important. This article will introduce how to use PHP to implement the add and delete functions in the shopping cart.

1. Basic functions of the shopping cart

Before introducing the specific implementation, let’s first understand the basic functions of the shopping cart. Usually the shopping cart has the following characteristics:

1. You can add items to the shopping cart

2. You can delete items from the shopping cart

3. You can view the items in the shopping cart Product list

4. You can modify the quantity or price of the goods in the shopping cart

5. You can perform settlement and payment operations

2. Add operations to the shopping cart

The most important thing to use when adding products to the shopping cart is session, the basic PHP function. When a user adds an item, you can store the item and quantity in a session variable, as follows:

$_SESSION['cart'][$product_id]['name'] = $name;
$_SESSION['cart'][$product_id]['price'] = $price;
$_SESSION['cart'][$product_id]['quantity'] = 1;

In the above example, first check if the SESSION variable named cart exists, if not, create a new empty array. Then, check if the element corresponding to $product_id exists, and if not, create a new array.

We then store the name, price, and quantity of the item in an array using the $name, $price, and $quantity variables. Each time the user clicks the "Add to Cart" button, the item's quantity is incremented by 1.

3. Shopping cart deletion operation

The operation of deleting items in the shopping cart is similar to the operation of adding items. You need to check the item in SESSION value and then remove the corresponding twin element via unset function.

First, check if the element to be deleted exists, then delete it using unset:

if(isset($_SESSION['cart'][$product_id])) {
unset ($_SESSION['cart'][$product_id]);
}

In the above code, we use isset to check whether the element to be deleted exists. If it exists, we use unset to delete it.

4. Implement the shopping cart product list

After implementing the add and delete operations, the next step is the task of displaying the product list in the shopping cart. The page should list all the items that have been added to the shopping cart and display the item name, image, price, quantity, and total price (unit price times quantity).

Here is a sample code to list all products:

foreach ($_SESSION['cart'] as $product_id => $product) {
$name = $product[ 'name'];
$price = $product['price'];
$quantity = $product['quantity'];
$total = $price * $quantity;
echo " ";
echo "$name";
echo "$price";
echo "$ quantity";
echo "$total";
echo "Delete";
echo "";
}

In the above code, we use a foreach loop to loop through all the items that have been added to the shopping cart and create a row of HTML tables for each item. We then store the item's name, price, quantity, and total price in variables and put them into table rows.

Finally, we added a "remove" link that the user can click to remove items from the cart, which will help with the code behind.

5. Modify the quantity or price of items in the shopping cart

When a customer changes the quantity or price of items in the shopping cart, you need to update the value of the SESSION variable. You can send changes to the server via input boxes or drop-down boxes.

The following is a sample code to modify the quantity or price of items in the shopping cart:

In the above example, we use the input box to display the quantity of the product, and use $product_id to store the quantity in the array .

6. Settlement and payment operations

Once the user completes the selection of products in the shopping cart and wants to proceed with checkout and payment, you need to build a link to the payment page. There should be a "Checkout" button on the shopping cart page so that users can easily proceed with payment. When the user clicks the button you should check if the user has added an item and if so then redirect them to the payment page.

The following code demonstrates how to redirect to the payment page:

if(isset($_SESSION['cart']) && count($_SESSION['cart'])>0) {
header('Location: checkout.php');
exit();
} else {
echo "The shopping cart is empty!";
}

In the above code, we use isset to check whether the SESSION variable exists, and use count to check whether the item exists in the shopping cart. If present, redirect the user to the checkout page. Otherwise, we display an error message to the user.

7. Summary

After studying the above content, I believe you have now mastered how to use PHP to implement the add and delete functions of the shopping cart. It is an essential part of developing an "e-commerce" website, providing a superior user experience and enhancing your website marketing efforts. In order to better complete the corresponding tasks, it is recommended that you continue to learn relevant knowledge, explore and practice different functions and technologies.

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