Completely disable WordPress comments

disable-wordpress-comments.php

/**
 * Code authored by Valentin Grenier - Studio Val
 * Freelance WordPress Developer from Toulouse, France
 * https://studio-val.fr
 *
 * Completely disable WordPress comments
 * 1. Removes from admin menu
 * 2. Removes from post and pages
 * 3. Removes from admin bar
 * 4. Prevents comments from being stored in the database
 */

function my_theme_remove_comments() {
    remove_menu_page('edit-comments.php');
}
add_action('admin_menu', 'my_theme_remove_comments');

function my_theme_remove_comment_support() {
    remove_post_type_support('post', 'comments');
    remove_post_type_support('page', 'comments');
}
add_action('init', 'my_theme_remove_comment_support', 100);

function my_theme_admin_bar_render() {
    global $wp_admin_bar;
    $wp_admin_bar->remove_menu('comments');
}
add_action('wp_before_admin_bar_render', 'my_theme_admin_bar_render');

// Prevent comments from being stored in the database
function my_theme_disable_comments($open, $post_id) {
    return false; // Disable comments for all posts
}
add_filter('comments_open', 'my_theme_disable_comments', 10, 2);
add_filter('pings_open', 'my_theme_disable_comments', 10, 2);