public static function upgrade() { global $wpdb; // run an upgrade, based on the version number if (get_option("masterpress_version") != MasterPress::$version || !self::table_exists("post_types") || isset($_GET["mp_install"])) { // Always add the latest table definitions here (when required) with dbDelta calls update_option("masterpress_version", MasterPress::$version); MasterPress::install(); } }