Tắt toàn bộ comments và XML-RPC, REST API

Đóng gói thành plugin hoặc thêm vào file function

<?php

/**
 * Plugin Name: WPE Disable All Comments
 * Description: Completely disables comments and related features in WordPress, including via XML-RPC and REST API.
 */
// Disable Comments Completely (Admin & Frontend)

function disable_all_comments() {

    // Disable comments for all post types
    foreach (get_post_types() as $post_type) {
        if (post_type_supports($post_type, 'comments')) {
            remove_post_type_support($post_type, 'comments');
            remove_post_type_support($post_type, 'trackbacks');
        }
    }

    // Remove dashboard comments metabox
    remove_meta_box('dashboard_recent_comments', 'dashboard', 'normal');

    // Disable XML-RPC comments
    add_filter('xmlrpc_methods', function($methods) {
        unset($methods['wp.newComment']);
        return $methods;
    });

    // Disable REST API comments
    add_filter('rest_endpoints', function($endpoints){
        if (isset($endpoints['/wp/v2/comments'])) {
            unset($endpoints['/wp/v2/comments']);
        }
        return $endpoints;
    });
}
add_action('admin_init', 'disable_all_comments');

// Redirect From Comments Page & Remove Menu Item
function disable_comments_admin_menu() {
    global $pagenow;

    // Redirect from comments page if accessed directly
    if ($pagenow === 'edit-comments.php') {
        wp_redirect(admin_url());
        exit;
    }

    // Remove the menu item
    remove_menu_page('edit-comments.php');
}
add_action('admin_menu', 'disable_comments_admin_menu');

// Remove Comments Links from Admin Bar
function disable_comments_admin_bar($wp_admin_bar) {
    $wp_admin_bar->remove_node('comments');
}
add_action('admin_bar_menu', 'disable_comments_admin_bar', 999);

// Close Comments and Hide Existing (Front-End)
add_filter('comments_open', '__return_false', PHP_INT_MAX);  // Highest priority
add_filter('pings_open', '__return_false', PHP_INT_MAX);
add_filter('comments_array', '__return_empty_array', PHP_INT_MAX);