How to add anti-spam functionality to your WordPress plugin

How to add anti-spam comment function to WordPress plug-in

In the process of using WordPress to build a website, we often encounter the problem of spam comments. Not only do spam comments take up database space, but they can also have a negative impact on our site's reputation. To solve this problem, we can add spam prevention functionality to WordPress plugins. This article describes a simple yet effective method and provides corresponding code examples.

First, we need to create a function to filter comments. In WordPress, there is a hook function called pre_comment_approved that can be used to filter comments before they are saved to the database. Through this hook function, we can write custom logic to determine whether a comment is a spam comment and set the corresponding status.

The following is an example function that determines whether a comment is spam before saving it, and sets the status to pending review:

function filter_comment( $approved, $commentdata ) {
    // 判断评论是否为垃圾评论的逻辑
    if ( your_spam_detection_logic() ) {
        $approved = '0'; // 设置状态为待审核
    }
    return $approved;
}
add_filter( 'pre_comment_approved', 'filter_comment', 10, 2 );

In the above code, we call your_spam_detection_logic( ) function to determine whether a comment is a spam comment. This function needs to be written according to actual needs, and can use some common spam comment characteristics, such as the number of links, sensitive words, duplicate content, etc. If a comment is determined to be spam, we set the status to pending (i.e. $approved = '0').

In order to use this function, we need to add the code to our own plug-in file, or use a custom function plug-in. After adding the above code to the plugin file, WordPress will call this function to filter comments before saving them.

In addition to filtering comments, you can also add other spam protection measures. For example, you can use Google reCAPTCHA to add verification code verification functionality. Below is a sample code that implements Google reCAPTCHA functionality:

function add_recaptcha_to_comment_form() {
    if ( your_recaptcha_verification_logic() ) {
        // 显示Google reCAPTCHA
        echo '<div class="g-recaptcha" data-sitekey="your_recaptcha_site_key"></div>';
    }
}
add_action( 'comment_form_after_fields', 'add_recaptcha_to_comment_form' );

function verify_recaptcha( $approved, $commentdata ) {
    // 验证Google reCAPTCHA
    if ( your_recaptcha_verification_logic() ) {
        $response = $_POST['g-recaptcha-response'];
        $recaptcha_secret_key = 'your_recaptcha_secret_key';
        $verify_url = 'https://www.google.com/recaptcha/api/siteverify';
        $data = array(
            'secret' => $recaptcha_secret_key,
            'response' => $response
        );
        $options = array(
            'http' => array(
                'method' => 'POST',
                'header' => "Content-Type: application/x-www-form-urlencoded
",
                'content' => http_build_query( $data )
            )
        );
        $context = stream_context_create( $options );
        $result = file_get_contents( $verify_url, false, $context );
        $result = json_decode( $result );
        if ( ! $result->success ) {
            wp_die( 'reCAPTCHA验证失败，请重新填写。' );
        }
    }
    return $approved;
}
add_filter( 'pre_comment_approved', 'verify_recaptcha', 10, 2 );

In the above code, we have added Google reCAPTCHA after the comment form. Determine whether the verification code needs to be displayed by calling the your_recaptcha_verification_logic() function. If a verification code is required, we verify the code before the comment is saved to ensure that the comment comes from a real user.

The above is one way to add anti-spam functionality to your WordPress plugin. Through custom functions and filter hooks, we can judge and handle spam comments according to our own needs. At the same time, the security of comments can be further improved by introducing verification mechanisms such as Google reCAPTCHA. Hope this article is helpful to you!

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