如何为WordPress插件添加防止垃圾评论功能

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 );

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 );