Paste the following code into your functions.php file or copy the following to “wp-content/mu-plugins/disable-comments.php” to use it as a “must-use plugin” (always-on and before “normals” plugins)
<?php
add_action('admin_init', function () {
// Redirect any user trying to access comments page
global $pagenow;
if ($pagenow === 'edit-comments.php' || $pagenow === 'options-discussion.php') {
wp_redirect(admin_url());
exit;
}
// Remove comments metabox from dashboard
remove_meta_box('dashboard_recent_comments', 'dashboard', 'normal');
// Disable support for comments and trackbacks in 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');
}
}
});
// Close comments on the front-end
add_filter('comments_open', '__return_false', 20, 2);
add_filter('pings_open', '__return_false', 20, 2);
// Hide existing comments
add_filter('comments_array', '__return_empty_array', 10, 2);
// Remove comments page and option page in menu
add_action('admin_menu', function () {
remove_menu_page('edit-comments.php');
remove_submenu_page('options-general.php', 'options-discussion.php');
});
// Remove comments links from admin bar
add_action('init', function () {
if (is_admin_bar_showing()) {
remove_action('admin_bar_menu', 'wp_admin_bar_comments_menu', 60);
}
});
