Use PHP to develop the question details display function in the knowledge Q&A website.

Use PHP to develop the question details display function in the knowledge Q&A website

With the development of the Internet, the knowledge Q&A website has become an important platform for people to obtain knowledge and share experiences. On these sites, users can ask questions and get answers from other users. In order to improve user experience, Q&A websites usually provide a question details display function, allowing users to view the detailed content of the question and related answers.

This article will introduce how to use PHP to develop a simple knowledge Q&A website and implement the function of displaying question details. For the convenience of explanation, we will use an imaginary Question class to simulate the data structure of the question, and a function getQuestionById that assumes a database is connected to obtain the question information with the specified id.

First, we need to create a PHP file for the question details page, named question_details.php. In this file, we can determine the issue id to display by getting the id in the URL parameter.

<?php
    // 获取问题 id
    $questionId = $_GET['id'];

    // 引入数据库连接函数
    require_once 'db_connect.php';

    // 获取问题信息
    $question = getQuestionById($questionId);

    // 判断问题是否存在
    if (!$question) {
        echo '问题不存在';
        exit;
    }

    // 展示问题详细内容
    echo '<h1>' . $question['title'] . '</h1>';
    echo '<p>' . $question['content'] . '</p>';

    // TODO: 展示问题的回答列表
?>

In the above code, we first obtain the id parameter in the URL, and obtain the question information corresponding to the id through the getQuestionById function. We then use the echo function to display the title and content of the question on the page.

Next, we need to implement the answer list function for displaying questions. We can use another function getAnswersByQuestionId to get the list of answers for the specified question id and display these answers in the question details page.

<?php
    // 获取问题 id
    $questionId = $_GET['id'];

    // 引入数据库连接函数
    require_once 'db_connect.php';

    // 获取问题信息
    $question = getQuestionById($questionId);

    // 判断问题是否存在
    if (!$question) {
        echo '问题不存在';
        exit;
    }

    // 展示问题详细内容
    echo '<h1>' . $question['title'] . '</h1>';
    echo '<p>' . $question['content'] . '</p>';

    // 获取回答列表
    $answers = getAnswersByQuestionId($questionId);

    // 判断是否有回答
    if (empty($answers)) {
        echo '暂无回答';
    } else {
        // 展示回答列表
        echo '<h2>回答：</h2>';
        foreach ($answers as $answer) {
            echo '<p>' . $answer['content'] . '</p>';
        }
    }
?>

In the above code, we introduced the database connection function and used the getAnswersByQuestionId function to obtain the answer list for the specified question id. Then, we use foreach to loop through the list of answers and display the content of each answer on the page.

Finally, we need to add links to other pages of the Q&A website so that users can click on the question title to jump to the question details page. Let's say our homepage shows the latest list of questions, we can add a link next to the question title.

<?php foreach ($questions as $question): ?>
    <h2><a href="question_details.php?id=<?php echo $question['id']; ?>"><?php echo $question['title']; ?></a></h2>
<?php endforeach; ?>

In the above code, we wrap a href tag with the href attribute outside the question title and pass the question id as a parameter Give question_details.php file. When users click on the question title, they will jump to the details page of the corresponding question.

With the flexibility of PHP and database operation functions, we used PHP to develop a simple knowledge question and answer website and implemented the question details display function. Users can click on the question title to view the details of the question and related answers. Of course, the above example is just a simple demonstration, and more functions and logic processing are needed in actual development. I hope this article can provide you with some development ideas and implementation methods for the problem details display function.

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