Dynamic shopping cart in PHP

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 Creating a dynamic shopping cart in PHP involves several steps. In this example, I'll outline a basic implementation of a shopping cart system using PHP and MySQL. This example assumes you have a basic understanding of PHP, MySQL, HTML, and CSS.

Step 1: Set Up Your Database

Create a MySQL database to store information about products and the shopping cart. Here's a simple database schema:

sql code

CREATE TABLE products (

    id INT AUTO_INCREMENT PRIMARY KEY,

    name VARCHAR(255) NOT NULL,

    price DECIMAL(10, 2) NOT NULL

);


CREATE TABLE cart (

    id INT AUTO_INCREMENT PRIMARY KEY,

    product_id INT NOT NULL,

    quantity INT NOT NULL,

    FOREIGN KEY (product_id) REFERENCES products(id)

);

Step 2: Create a Product Listing Page

Create a PHP page that lists your products. This page will display a list of products with an "Add to Cart" button for each product.

php code

<?php

// Connect to your MySQL database here

// Query to fetch products from the database

$query = "SELECT * FROM products";

$result = mysqli_query($connection, $query);

if (!$result) {

    die("Database query failed.");

}

?>

<!DOCTYPE html>

<html>

<head>

    <title>Product List</title>

</head>

<body>

    <h1>Product List</h1>

    <table>

        <tr>

            <th>Name</th>

            <th>Price</th>

            <th>Action</th>

        </tr>

        <?php while ($row = mysqli_fetch_assoc($result)) { ?>

            <tr>

                <td><?= $row['name'] ?></td>

                <td><?= $row['price'] ?></td>

                <td>

                    <form method="post" action="add_to_cart.php">

                        <input type="hidden" name="product_id" value="<?= $row['id'] ?>">

                        <input type="number" name="quantity" value="1" min="1">

                        <input type="submit" value="Add to Cart">

                    </form>

                </td>

            </tr>

        <?php } ?>

    </table>

</body>

</html>

Step 3: Create the "Add to Cart" Logic

Create a PHP script (add_to_cart.php) that handles adding products to the shopping cart.

php code

<?php

// Connect to your MySQL database here

if ($_SERVER['REQUEST_METHOD'] === 'POST') {

    $product_id = $_POST['product_id'];

    $quantity = $_POST['quantity'];

    // Check if the product is already in the cart

    $cart_query = "SELECT * FROM cart WHERE product_id = $product_id";

    $cart_result = mysqli_query($connection, $cart_query);

    if (mysqli_num_rows($cart_result) > 0) {

        // Product is already in the cart, update the quantity

        $cart_row = mysqli_fetch_assoc($cart_result);

        $new_quantity = $cart_row['quantity'] + $quantity;

        $update_query = "UPDATE cart SET quantity = $new_quantity WHERE product_id = $product_id";

        mysqli_query($connection, $update_query);

    } else {

        // Product is not in the cart, insert a new record

        $insert_query = "INSERT INTO cart (product_id, quantity) VALUES ($product_id, $quantity)";

        mysqli_query($connection, $insert_query);

    }

}

header("Location: product_list.php");

exit();

Step 4: Create a Shopping Cart Page

Create a PHP page (cart.php) that displays the contents of the shopping cart and allows users to update or remove items.

php code

<?php

// Connect to your MySQL database here

// Fetch items from the cart

$cart_query = "SELECT products.id, products.name, products.price, cart.quantity

               FROM products

               INNER JOIN cart ON products.id = cart.product_id";

$cart_result = mysqli_query($connection, $cart_query);

if (!$cart_result) {

    die("Database query failed.");

}

?>

<!DOCTYPE html>

<html>

<head>

    <title>Shopping Cart</title>

</head>

<body>

    <h1>Shopping Cart</h1>

    <table>

        <tr>

            <th>Name</th>

            <th>Price</th>

            <th>Quantity</th>

            <th>Total</th>

            <th>Action</th>

        </tr>

        <?php while ($cart_row = mysqli_fetch_assoc($cart_result)) { ?>

            <tr>

                <td><?= $cart_row['name'] ?></td>

                <td><?= $cart_row['price'] ?></td>

                <td>

                    <form method="post" action="update_cart.php">

                        <input type="hidden" name="product_id" value="<?= $cart_row['id'] ?>">

                        <input type="number" name="quantity" value="<?= $cart_row['quantity'] ?>" min="1">

                        <input type="submit" value="Update">

                    </form>

                </td>

                <td><?= $cart_row['price'] * $cart_row['quantity'] ?></td>

                <td>

                    <form method="post" action="remove_from_cart.php">

                        <input type="hidden" name="product_id" value="<?= $cart_row['id'] ?>">

                        <input type="submit" value="Remove">

                    </form>

                </td>

            </tr>

        <?php } ?>

    </table>

</body>

</html>

Step 5: Create Logic for Updating and Removing Items

Create PHP scripts (update_cart.php and remove_from_cart.php) to handle updating the cart and removing items from the cart. These scripts are similar to the add_to_cart.php script but with appropriate logic for updating and removing items.

This is a basic example of creating a dynamic shopping cart in PHP. You can expand and enhance this system with features like user authentication, checkout, and payment processing to build a complete e-commerce solution. Additionally, consider using frameworks and libraries to simplify the development process and enhance security.

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