How to use PHP Developer City to implement product classification navigation function

How to use PHP Developer City to implement product classification navigation function

With the rapid development of e-commerce, more and more people choose to shop online. In order to facilitate users to browse and purchase products, mall websites usually provide product classification navigation functions. When developing a city website, the product classification navigation function can be easily implemented using PHP language.

1. Database design

Before starting development, you first need to design the database. The product category navigation function of the mall website requires product category information. Usually, product classification is multi-level, which means that one category can contain multiple subcategories. Therefore, in the design of the database, a table can be used to store product category information.

The design of the database table can include the following fields:

1. id: represents the unique identifier of the category, generally using an auto-increasing integer.
2. name: Indicates the name of the category.
3. parent_id: Indicates the id of the parent category of this category, used to indicate the hierarchical relationship between categories.

2. Steps to implement product classification navigation function

1. Connecting to the database
   In PHP, you can use extensions such as mysqli or PDO to connect to the database. First, you need to add database connection related information to the code, including database address, user name, password, etc. Then create a database connection using the corresponding extension.
2. Query the list of product categories
   Using the database connection, you can write SQL statements to query the list of product categories. According to the hierarchical relationship, the queried data can be traversed recursively or circularly to generate the corresponding category navigation tree structure.
3. Display product category navigation
   When writing HTML code, the corresponding navigation menu can be generated based on the queried category list. Navigation menus can be implemented using unordered lists and hyperlinks. By adding corresponding parameters to the hyperlink of the navigation menu, you can click the navigation menu to jump to the corresponding category filtering page.
4. Category filtering function
   In the category filtering page, you can query the product list under the category based on different category IDs. According to the queried product list, it can be displayed on the page for users to browse and purchase.

3. Code Example

The following is a simple example code that demonstrates how to use PHP to implement product classification navigation function:

<?php
// 连接数据库
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mall_db";

$conn = new mysqli($servername, $username, $password, $dbname);

// 查询商品类别列表
function getCategories($conn, $parent_id = 0) {
  $sql = "SELECT * FROM categories WHERE parent_id = $parent_id";
  $result = $conn->query($sql);

  if ($result->num_rows > 0) {
    echo "<ul>";
    while($row = $result->fetch_assoc()) {
      $id = $row['id'];
      $name = $row['name'];
      echo "<li><a href='category.php?id=$id'>$name</a>";
      getCategories($conn, $id);
      echo "</li>";
    }
    echo "</ul>";
  }
}

// 显示商品分类导航
echo "<h1>商品分类导航</h1>";
getCategories($conn);

$conn->close();
?>

In the above code, through The recursive function getCategories traverses the category list and generates the corresponding navigation menu.

Summary

It is not complicated to use PHP Developer City to realize product classification navigation function. Through database design and PHP programming, the hierarchical relationship of product categories and the corresponding navigation menu can be easily realized. In this way, users can easily browse and purchase the products they are interested in, improving the shopping experience.

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