Use PHP to develop question following and tracking functions in the Q&A website.

Use PHP to develop question following and tracking functions in a knowledge question and answer website

In a knowledge question and answer website, question following and tracking functions are one of the very important features. It allows users to follow issues of interest and get the latest updates at any time. This article will describe how to develop these two functions using PHP.

First of all, we need to have a database table of questions, which contains information related to the question, such as the question's title, content, author, etc. In this table, we can add two fields to represent the number of people following the issue and the number of people following it. We can name these fields "follow_count" and "track_count".

Next, we need to create the problem details page. On this page, users can see the details of the issue and have the opportunity to follow and follow up on it. Create an HTML form where the user can trigger both actions by clicking a button.

First, let’s take a look at the question focus function. When the user clicks the follow button, we need to do the following:

1. Check if the user is logged in. If the user is not logged in, the user needs to be prompted to log in or jump to the login page.
2. When the user is logged in, we need to update the number of followers field in the question's database table. Get the number of followers of the current issue by querying the database and add one to it.

The following is a sample code:

<?php
session_start();

// 检查用户是否已登录
if (!isset($_SESSION['username'])) {
    echo "请先登录";
    // 或者跳转至登录页面
    header("Location: login.php");
    exit;
}

// 更新关注人数字段
$questionId = $_GET['question_id']; // 从 URL 中获取问题 ID
$followCount = // 从数据库中查询当前问题的关注人数
$followCount += 1; // 加一
// 执行更新操作

Next, let’s take a look at the issue tracking function. When the user clicks the tracking button, we need to perform the following actions:

1. Check if the user is logged in. If the user is not logged in, the user needs to be prompted to log in or jump to the login page.
2. When the user is logged in, we need to update the tracking number field in the database table of the question. Query the database to get the number of people tracking the current issue and add one to it.

The following is a sample code:

<?php
session_start();

// 检查用户是否已登录
if (!isset($_SESSION['username'])) {
    echo "请先登录";
    // 或者跳转至登录页面
    header("Location: login.php");
    exit;
}

// 更新追踪人数字段
$questionId = $_GET['question_id']; // 从 URL 中获取问题 ID
$trackCount = // 从数据库中查询当前问题的追踪人数
$trackCount += 1; // 加一
// 执行更新操作

The above code demonstrates how to use PHP to implement the question following and tracking functions in the knowledge Q&A website. By updating the following and following fields in the database table, we can track and display this information to provide a better user experience.

Of course, the above code is just a simple example and does not involve the actual operation of the database. In actual development, we need to use SQL query statements to update the following and tracking number of people fields based on the specific conditions of the database.

I hope the above code examples will be helpful to you, and I wish you success in implementing the question following and tracking functions in the Q&A website!

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