Remove comments on WordPress without a plugin

remove-comments-wordpress.php

<?php

add_action('init', 'remove_comment_support', 100);
function remove_comment_support() {

    // Remove post type support for each post type
    foreach (get_post_types() as $post_type) {
        if (post_type_supports( $post_type, 'comments' )) {

            // Don't remove comment support for shop orders
            if ($post_type !== 'shop_order') {
                remove_post_type_support( 'page', 'comments' );
            }
        }
    }

    // Uncomment the following to force hiding comment meta boxes
    // remove_meta_box( 'commentsdiv', 'post', 'normal' );

}

// Hide edit screen in WP backend
add_action( 'admin_menu', 'remove_comments_page' );
function remove_comments_page() {
    remove_menu_page( 'edit-comments.php' );
}