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Starting from Scratch: A Guide to Development of PHP and MySQL Shopping Cart Functions

王林

Mar 15, 2024 pm 04:18 PM

mysqlphpshopping cart

Starting from Scratch: A Guide to Development of PHP and MySQL Shopping Cart Functions

"Starting from Scratch: Development Guide for PHP and MySQL Shopping Cart Functions"

In today's era of popular e-commerce, online shopping has become a convenient and fast way consumption patterns. The online shopping cart, as a temporary area for consumers to add products, has become an indispensable part of the e-commerce website. This article will teach readers how to develop a simple PHP and MySQL shopping cart function from scratch, helping readers better understand how online shopping carts are implemented.

Step 1: Create a database

First, we need to create a database named shopping_cart and a table named products, Used to store our product information. In the products table, we can include at least the following fields: id (product ID), name (product name), price ( product price) and image (product image).

CREATE DATABASE shopping_cart;

USE shopping_cart;

CREATE TABLE products (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    price DECIMAL(10, 2) NOT NULL,
    image VARCHAR(255) NOT NULL
);

Step 2: Create a product page

Next, we need to create a simple product page to display our product information. Here we take a simple HTML page as an example:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Shopping Cart</title>
</head>
<body>
    <h1 id="Product-list">Product list</h1>

    <?php
    $db = new mysqli('localhost', 'root', '', 'shopping_cart');

    $query = $db->query("SELECT * FROM products");
    while($row = $query->fetch_assoc()) {
        echo '
            <div>
                <img src="/static/imghwm/default1.png"  data-src="'.$row['image'].'"  class="lazy".$row['image'].'" alt="'.$row['name'].'"    style="max-width:90%">
                <h3 id="row-name">'.$row['name'].'</h3>
                <p>Price: $'.$row['price'].'</p>
                <a href="add_to_cart.php?id='.$row['id'].'">Add to Cart</a>
            </div>
        ';
    }
    ?>

</body>
</html>

Step Three: Add to Cart Function

Then, we need to create a file named add_to_cart.php to add the product Add to Cart. In this file, we will receive the passed product ID and store it in the Session.

<?php
session_start();

if(isset($_GET['id'])) {
    $id = $_GET['id'];

    if(isset($_SESSION['cart'][$id])) {
        $_SESSION['cart'][$id]['quantity'] ;
    } else {
        $_SESSION['cart'][$id] = array(
            'quantity' => 1
        );
    }

    header('Location: index.php');
    exit;
}
?>

Step 4: Display the shopping cart

Finally, we need to display the product information that has been added to the shopping cart and provide the function of deleting products. Here, we create a file named cart.php to display the shopping cart information.

<?php
session_start();
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Shopping Cart</title>
</head>
<body>
    <h1 id="Shopping-Cart">Shopping Cart</h1>

    <ul>
        <?php
        if(isset($_SESSION['cart'])) {
            foreach($_SESSION['cart'] as $id => $item) {
                $product = $db->query("SELECT * FROM products WHERE id = $id")->fetch_assoc();

                echo '
                    <li>
                        <img src="/static/imghwm/default1.png"  data-src="'.$product['image'].'"  class="lazy".$product['image'].'" alt="'.$product['name'].'"    style="max-width:90%">
                        <h4 id="product-name">'.$product['name'].'</h4>
                        <p>Price: $'.$product['price'].'</p>
                        <p>Quantity: '.$item['quantity'].'</p>
                        <a href="remove_from_cart.php?id='.$id.'">Remove</a>
                    </li>
                ';
            }
        } else {
            echo '<p>Your shopping cart is empty. </p>';
        }
        ?>
    </ul>
</body>
</html>

Summary

Through the above steps, we successfully created a simple PHP and MySQL shopping cart function. Readers can expand and optimize the functions according to their own needs, such as adding total price calculation, settlement page and other functions. I hope this article can help readers better understand the development process of shopping cart functionality.

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