Snippet to disable comments & pingbacks on the site

					<?php
/**
 * Disable comments on the site.
 */
function atar4u_disable_comments() {
    // Disable support for comments on all post types
    $post_types = get_post_types();
    foreach ( $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 all existing posts
    $wpdb = $GLOBALS['wpdb'];
    $wpdb->query( "UPDATE $wpdb->posts SET comment_status = 'closed'" );
    $wpdb->query( "UPDATE $wpdb->posts SET ping_status = 'closed'" );
    
    // Remove comment links from the admin menu
    remove_menu_page( 'edit-comments.php' );
    remove_submenu_page( 'options-general.php', 'options-discussion.php' );
    
    // Redirect any comment-related URLs to the homepage
    if ( is_admin() && isset( $_GET['action'] ) && $_GET['action'] === 'editcomment' ) {
        wp_redirect( home_url() );
        exit;
    }
}
add_action( 'init', 'atar4u_disable_comments' );