public static function get_wp_tables()
{
global $wpdb;
$tables = $wpdb->get_results($wpdb->prepare("SHOW TABLES LIKE %s;", str_replace('_', '\\_', $wpdb->prefix) . '%'), ARRAY_N);
$tables = array_map('reset', $tables);
// no alternative tables
$tables = array_diff($tables, self::get_tmp_wp_tables());
return $tables;
}