Analysis of shopping mall comment like function developed using PHP

Analysis of the mall comment and like function developed using PHP

In the mall system, the user comment function is a very important part. However, in order to increase user participation and activity, the comment function in the mall system usually adds a like function, which allows users to like the comments. This article will use PHP to develop a mall comment and like function, and analyze and implement it.

1. Database design

First, we need to design a database to store information about comments and likes. Suppose we have two data tables, one is the comment table (comment) and the other is the like table (like). The comments table contains the following fields: comment_id(int), user_id(int), content(text), create_time(datetime). The like table contains the following fields: like_id(int), user_id(int), comment_id(int), create_time(datetime).

2. Display comments and like buttons

In the mall product details page, we need to display product reviews and add a like button for each comment. Suppose we use a comments array to store comment information, we can use the following HTML code to display comments and like buttons:

<?php foreach ($comments as $comment): ?>
<div class="comment">
    <p><?php echo $comment['content']; ?></p>
    <button class="like-button" data-comment-id="<?php echo $comment['comment_id']; ?>">点赞</button>
    <span class="like-count">0</span>
</div>
<?php endforeach; ?>

In the above code, we set a data- for each like button comment-id attribute, which stores the comment_id of the corresponding comment.

3. Handling like requests

Next, we need to handle the user’s like requests for comments. We can use jQuery to handle asynchronous requests. In the JavaScript code at the bottom of the page, we can use the following code to handle the like request:

$(document).on('click', '.like-button', function() {
    var commentId = $(this).data('comment-id');
    
    $.ajax({
        url: 'like.php',
        type: 'POST',
        data: {
            commentId: commentId
        },
        success: function(response) {
            if (response.success) {
                // 点赞成功
                var likeCount = parseInt($(this).siblings('.like-count').text()) + 1;
                $(this).siblings('.like-count').text(likeCount);
            } else {
                // 点赞失败
            }
        }
    });
});

In the above code, we obtain the comment_id of the corresponding comment by clicking the button and send an asynchronous POST request to the like.php file. In the like.php file, we can write PHP code to handle like requests.

4. Backend processing for handling like requests

In the like.php file, we can use the following PHP code to handle like requests:

<?php
$commentId = $_POST['commentId'];
$userId = $_SESSION['userId']; // 假设我们已经获取了当前用户的ID

// 判断用户是否已经点赞过该评论
$liked = checkIfLiked($commentId, $userId);

if (!$liked) {
    // 执行点赞操作
    $success = likeComment($commentId, $userId);
    
    if ($success) {
        echo json_encode(['success' => true]);
    } else {
        echo json_encode(['success' => false]);
    }
} else {
    echo json_encode(['success' => false]);
}

function checkIfLiked($commentId, $userId) {
    // 在点赞表中查询是否存在对应的点赞记录
    // 如果存在，返回true；否则，返回false
}

function likeComment($commentId, $userId) {
    // 在点赞表中插入一条点赞记录
    // 如果插入成功，返回true；否则，返回false
}

In the above code, we first determine whether the current user has liked the comment. If the user has not liked it, we perform the like operation and return a success status; if the user has already liked it, we return a failure status.

5. Update the number of likes

After the like request is successful, we need to update the display of the number of likes for the corresponding comment. In the front-end JavaScript code, we use the AJAX success callback function to update the number of likes. Specifically, we obtain the number of likes corresponding to the current comment and add 1, and then update the result to the display of the number of likes corresponding to the comment.

Through the above steps, we successfully developed the mall comment and like function using PHP. Users can click the like button under the comment to like the comment, and the number of likes will be updated accordingly. Such a function not only increases user participation and user evaluation reference for products, but also provides a way for users to express their opinions.

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