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How to use the PHP developer city function: build a backend management system

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Aug 02, 2023 am 09:39 AM

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How to use the PHP developer city function: build a backend management system

In today's digital era, e-commerce has become an important direction of business development. For enterprises or individual developers who want to conduct online business, it is crucial to build a powerful mall backend management system. As a scripting language widely used in web development, PHP can realize various functions of the mall through its rich functions and flexible features. This article will introduce how to use PHP to develop the backend management system of the city function and provide corresponding code examples.

Set up the development environment
Before starting development, you first need to set up a suitable development environment. It is recommended to use a combination of Apache server, MySQL database and PHP, which is often called AMP (Apache MySQL PHP). It can be quickly built by installing software packages or integrated environments (such as XAMPP, WAMP).

Database Design
The core of the mall backend management system is the database, which stores product information, order information, user information, etc. When designing the database structure, you need to consider the functional requirements of the mall and establish the corresponding table structure according to the requirements. The following is a simple database design example:

CREATE TABLE `products` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  `price` decimal(10,2) NOT NULL,
  `description` text NOT NULL,
  PRIMARY KEY (`id`)
);

CREATE TABLE `orders` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NOT NULL,
  `product_id` int(11) NOT NULL,
  `quantity` int(11) NOT NULL,
  `total_price` decimal(10,2) NOT NULL,
  PRIMARY KEY (`id`)
);

CREATE TABLE `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
);

Backend login function
In order to ensure the security of the mall's backend management system, a login function needs to be implemented. The following is a code example of a simple backend login function:

<?php
session_start();

// 登录验证
if(isset($_POST['username']) && isset($_POST['password'])) {
  $username = $_POST['username'];
  $password = $_POST['password'];

  // TODO: 验证用户名和密码是否匹配

  if ($valid) {
 $_SESSION['admin'] = true;
 header("Location: admin.php");
 exit();
  } else {
 $error = "用户名或密码错误";
  }
}
?>

<!DOCTYPE html>
<html>
<head>
  <title>后台登录</title>
</head>
<body>
  <h1 id="后台登录">后台登录</h1>
  <form method="POST" action="">
 <input type="text" name="username" placeholder="用户名" required><br>
 <input type="password" name="password" placeholder="密码" required><br>
 <input type="submit" value="登录">
  </form>
  <?php if(isset($error)): ?>
 <p><?php echo $error; ?></p>
  <?php endif; ?>
</body>
</html>

Product management function
The mall backend management system needs to implement the function of adding, deleting, modifying, and checking products. The following is a code example of a simple product management function:

<?php
session_start();

if (!isset($_SESSION['admin'])) {
  header("Location: login.php");
  exit();
}

// 连接数据库
$mysqli = new mysqli("localhost", "username", "password", "database");

// 获取所有商品
$result = $mysqli->query("SELECT * FROM products");

// 显示商品列表
?>
<!DOCTYPE html>
<html>
<head>
  <title>商品管理</title>
</head>
<body>
  <h1 id="商品管理">商品管理</h1>
  <table>
 <tr>
   <th>ID</th>
   <th>名称</th>
   <th>价格</th>
   <th>描述</th>
   <th>操作</th>
 </tr>
 <?php while ($row = $result->fetch_assoc()): ?>
   <tr>
     <td><?php echo $row['id']; ?></td>
     <td><?php echo $row['name']; ?></td>
     <td><?php echo $row['price']; ?></td>
     <td><?php echo $row['description']; ?></td>
     <td>
       <a href="edit_product.php?id=<?php echo $row['id']; ?>">编辑</a>
       <a href="delete_product.php?id=<?php echo $row['id']; ?>">删除</a>
     </td>
   </tr>
 <?php endwhile; ?>
  </table>
  <a href="add_product.php">添加商品</a>
</body>
</html>

Order management function
The mall backend management system also needs to manage orders. The following is a code example of a simple order management function:

<?php
session_start();

if (!isset($_SESSION['admin'])) {
  header("Location: login.php");
  exit();
}

// 连接数据库
$mysqli = new mysqli("localhost", "username", "password", "database");

// 获取所有订单
$result = $mysqli->query("SELECT * FROM orders");

// 显示订单列表
?>
<!DOCTYPE html>
<html>
<head>
  <title>订单管理</title>
</head>
<body>
  <h1 id="订单管理">订单管理</h1>
  <table>
 <tr>
   <th>ID</th>
   <th>用户ID</th>
   <th>商品ID</th>
   <th>数量</th>
   <th>总价</th>
   <th>操作</th>
 </tr>
 <?php while ($row = $result->fetch_assoc()): ?>
   <tr>
     <td><?php echo $row['id']; ?></td>
     <td><?php echo $row['user_id']; ?></td>
     <td><?php echo $row['product_id']; ?></td>
     <td><?php echo $row['quantity']; ?></td>
     <td><?php echo $row['total_price']; ?></td>
     <td>
       <a href="edit_order.php?id=<?php echo $row['id']; ?>">编辑</a>
       <a href="delete_order.php?id=<?php echo $row['id']; ?>">删除</a>
     </td>
   </tr>
 <?php endwhile; ?>
  </table>
</body>
</html>

Through the above example, you can learn how to use the backend management system of the PHP developer mall function. Of course, the above is just a simple example, and actual development may be more complicated. This needs to be expanded and optimized based on actual needs. I hope this article will be helpful to you when developing the backend management system of the city!

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