How to develop simple e-commerce functionality using PHP

How to use PHP to develop simple e-commerce functions

In today's era of developed Internet, e-commerce has become the main way for people to shop. If you plan to develop a simple e-commerce website, using PHP as the backend language is a good choice. This article will introduce you to how to use PHP to develop simple e-commerce functions and provide specific code examples.

1. Environment setup

First, you need to set up a PHP development environment in your local environment. You can use integrated environments such as XAMPP, WAMP or MAMP, or manually build environments for PHP, MySQL and Apache. Make sure you have the latest PHP version installed and can run PHP commands from the command line.

2. Database Design

Before developing an e-commerce website, you need to design the database structure. A simple e-commerce website usually requires the following core tables:

• User table (users): used to store the user's login information and personal data.
• Product table (products): used to store product information, such as name, price, description, etc.
• Orders table (orders): used to store user order information, such as order number, product ID, quantity, etc.

You can use MySQL or other relational databases to create these tables and ensure that there are appropriate relationships between them.

3. Registration and login function

E-commerce websites usually require users to register and log in. The following is a code example for a simple user registration and login function:

Registration page (register.php):

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
   // 获取用户提交的表单数据
   $username = $_POST['username'];
   $password = $_POST['password'];

   // 将数据插入到用户表中
   $sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
   
   // 执行SQL语句
   // ...
}
?>
<form method="POST" action="register.php">
   <input type="text" name="username" placeholder="用户名">
   <input type="password" name="password" placeholder="密码">
   <button type="submit">注册</button>
</form>

Login page (login.php):

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
   // 获取用户提交的表单数据
   $username = $_POST['username'];
   $password = $_POST['password'];

   // 查询用户表中是否有匹配的用户名和密码
   $sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
   
   // 执行SQL查询
   // ...
}
?>
<form method="POST" action="login.php">
   <input type="text" name="username" placeholder="用户名">
   <input type="password" name="password" placeholder="密码">
   <button type="submit">登录</button>
</form>

These code examples demonstrate how to use PHP to receive user-submitted form data and insert the data into or query a user table.

4. Product display and purchase function

Next, we need to implement the product display and purchase function. The following is a code example of a simple product display page and purchase function:

Product display page (products.php):

<?php
// 查询商品表中的所有商品
$sql = "SELECT * FROM products";

// 执行SQL查询
// ...

// 遍历查询结果，展示商品信息
while ($row = mysqli_fetch_assoc($result)) {
   echo "<h3 id="row-name">{$row['name']}</h3>";
   echo "<p>{$row['description']}</p>";
   echo "<p>价格：{$row['price']}元</p>";
   echo "<a href='buy.php?id={$row['id']}'>购买</a>";
}
?>

Purchase page (buy.php):

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
   // 获取用户提交的表单数据
   $productId = $_POST['productId'];
   $quantity = $_POST['quantity'];

   // 将订单数据插入到订单表中
   $sql = "INSERT INTO orders (user_id, product_id, quantity) VALUES ('$userId', '$productId', '$quantity')";
   
   // 执行SQL语句
   // ...
}
?>
<form method="POST" action="buy.php">
   <input type="hidden" name="productId" value="<?php echo $_GET['id']; ?>">
   <input type="number" name="quantity" placeholder="购买数量">
   <button type="submit">购买</button>
</form>

These code examples demonstrate how to use PHP to query the product table and display product information, and how to receive the form data purchased by the user and insert the order data into the order table.

The above is a simple e-commerce website development process and related code examples. Of course, more functions can be added according to your actual needs, such as shopping cart, payment, etc. Hope this article helps you!

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