How to Add Guest Posting Feature to WordPress Plugin

How to add guest message function to WordPress plug-in

Introduction:
WordPress is one of the most popular open source content management systems at present, and it provides a wealth of plug-ins to extend website functionality. Among them, the guest message function is a feature that many website owners value very much. This article will introduce how to add guest message functionality to WordPress plug-in and provide code examples.

1. Understand the WordPress plug-in structure
Before starting to add the guest message function to the WordPress plug-in, we need to understand the basic structure of the plug-in. A WordPress plugin usually consists of a main file and several auxiliary files. The main file is the entry point of the plug-in and is responsible for defining the basic information and functions of the plug-in. We will add the implementation of the guest message function to the main file.

2. Create a comment form
In order to implement the guest message function, we first need to create a comment form to allow users to enter the message content. In the main file, we can create a form using WordPress’s comment form feature. The code example is as follows:

function show_comment_form() {
    ob_start();
    comment_form();
    $comment_form = ob_get_clean();
    return $comment_form;
}

// 将评论表单显示在页面中的某个位置
function display_comment_form() {
    echo show_comment_form();
}

In this example, the show_comment_form() function is used to generate the HTML code of the comment form, and then output it to a certain location on the page through the echo statement.

3. Save the message to the database
After the visitor fills out and submits the comment form, we need to save the message content to the database. WordPress provides an API to operate the database, and we can write code in the main file to implement this function. The sample code is as follows:

// 在保存评论前执行的回调函数
function save_comment_to_database($comment_id) {
    // 获取留言内容
    $comment_content = $_POST['comment'];
    
    // 将留言内容保存到数据库中的自定义表格中
    $wpdb->insert(
        $wpdb->prefix . 'custom_comments',
        array(
            'comment_content' => $comment_content
        )
    );
}

// 注册评论保存前的钩子函数
add_action('comment_post', 'save_comment_to_database');

In this example, the save_comment_to_database() function will be executed before the comment is saved, obtain the message content through the $_POST variable, and use the wpdb object to insert the message content into a custom database table .

4. Display messages
After the message is saved to the database, we need to display it somewhere on the website. To achieve this, we can add a shortcode to the main file so that users can insert the shortcode in the page where the message needs to be displayed. The sample code is as follows:

// 显示留言的回调函数
function display_comments($atts) {
    // 获取自定义数据库中的留言内容
    global $wpdb;
    $comments = $wpdb->get_results("SELECT * FROM {$wpdb->prefix}custom_comments");
    
    // 遍历留言内容，输出到页面中
    foreach ($comments as $comment) {
        echo $comment->comment_content . '<br>';
    }
}

// 注册短代码
add_shortcode('show_comments', 'display_comments');

In this example, the display_comments() function will obtain the message content from the custom database table and output it to the page through the echo statement. Users only need to insert the [show_comments] short code in the page where comments need to be displayed.

Conclusion:
Through the above steps, we can add the guest message function to the WordPress plug-in. First, we create a comment form that allows users to fill in the message content; then, we save the message content into a custom database table; finally, we display the message content somewhere on the website through a short code. The above is a simple implementation example. In actual use, we can also carry out differentiated function expansion and optimization according to needs.

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