How to use PHP Developer City to implement the shopping cart saving function

How to use PHP Developer City to realize the shopping cart saving function

With the development of the Internet, e-commerce has become one of the main ways for people to shop. In e-commerce websites, the shopping cart function is a very important function. The shopping cart can help users save and manage their purchased items conveniently, providing users with a good shopping experience. In this article, we will introduce how to use the PHP Developer City to implement the shopping cart saving function.

1. Create database and shopping cart table

First, we need to create a database to store shopping cart information. In the database, we can create a table named "cart" to store shopping cart related information. The shopping cart table can include the following fields: product ID, user ID, product name, product price, product quantity, etc.

We can use MySQL database to create the shopping cart table. You can use the following SQL statement to create a shopping cart table:

CREATE TABLE cart (
id INT(11) AUTO_INCREMENT PRIMARY KEY,
product_id INT(11) NOT NULL,
user_id INT( 11) NOT NULL,
product_name VARCHAR(255) NOT NULL,
price DECIMAL(10, 2) NOT NULL,
quantity INT(11) NOT NULL
);

2. Create a shopping cart page

In PHP, we can create a shopping cart page to display the user's shopping cart content. In the shopping cart page, we can list the products selected by the user and display the name, price and quantity of the products.

In the shopping cart page, we can use PHP's database query function to obtain the data in the shopping cart table. You can use the following PHP code to query product information in the shopping cart:

// Connect to the database
$conn = mysqli_connect('localhost', 'username', 'password' , 'database');

// Query product information in the shopping cart
$query = "SELECT * FROM cart WHERE user_id = $user_id";
$result = mysqli_query($conn, $query);

// Traverse the query results and output product information
while ($row = mysqli_fetch_assoc($result)) {
echo "Product name:" . $row['product_name' ] . "
";
echo "Item price:" . $row['price'] . "
";
echo "Item quantity:" . $row['quantity'] . "

";
}
?>

3. Implement the functions of adding products and updating the shopping cart

In the mall, users can click on the products The "Add to Cart" button adds items to the cart. We can use PHP's form submission function to add items to the shopping cart. When the user clicks the "Add to Cart" button, the following PHP code can be used to add items to the shopping cart table:

// Connect to the database
$conn = mysqli_connect( 'localhost', 'username', 'password', 'database');

// Get product information
$product_id = $_POST['product_id'];
$quantity = $_POST ['quantity'];

// Check whether the product already exists in the shopping cart, update the quantity if it exists, otherwise add a new product
$query = "SELECT * FROM cart WHERE product_id = $product_id AND user_id = $user_id";
$result = mysqli_query($conn, $query);
if (mysqli_num_rows($result) > 0) {
// Update the quantity of items in the shopping cart
$query = "UPDATE cart SET quantity = quantity $quantity WHERE product_id = $product_id AND user_id = $user_id";
mysqli_query($conn, $query);
} else {
// Add Add new items to cart
$query = "INSERT INTO cart (product_id, user_id, product_name, price, quantity) VALUES ($product_id, $user_id, '$product_name', $price, $quantity)";
mysqli_query($conn, $query);
}
?>

4. Implement the function of deleting shopping cart items

In the shopping cart page, users can choose to delete Items in shopping cart. We can use PHP's database operation function to implement the function of deleting shopping cart items. When the user clicks the "Delete" button, the following PHP code can be used to delete the items in the shopping cart:

// Connect to the database
$conn = mysqli_connect('localhost', 'username', 'password', 'database');

// Get the product ID to be deleted
$product_id = $_GET['product_id'];

// Delete Items in the shopping cart
$query = "DELETE FROM cart WHERE product_id = $product_id AND user_id = $user_id";
mysqli_query($conn, $query);
?>

The above are the basic steps and code for using the PHP Developer City to implement the shopping cart saving function. I hope this article will be helpful to developers who want to develop e-commerce websites. The shopping cart is one of the important functions in an e-commerce website. Through reasonable design and implementation, it can greatly improve the user's shopping experience.

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