WordPress Disable Core and Plugin Updates

updates-controller.php

<?php
/**
 * Plugin Name: Updates Controller
 * Description: Security upgrades and custom settings
 * Version: 1.0.0
 * License: GPL3+
 */

namespace MustUse\CustomSettings;

add_filter('pre_site_transient_update_core', __NAMESPACE__ . '\remove_core_updates');
add_filter('pre_site_transient_update_plugins', __NAMESPACE__ . '\remove_core_updates');
add_filter('pre_site_transient_update_themes', __NAMESPACE__ . '\remove_core_updates');
function remove_core_updates() {
    global $wp_version;
    return (object) array('last_checked' => time(), 'version_checked' => $wp_version,);
}


add_filter('site_transient_update_plugins', __NAMESPACE__ . '/disable_plugin_updates');
function disable_plugin_updates($value) {
    unset($value->response[ plugin_basename(__FILE__) ]);
    return $value;
}