public static function set_variables() { if (!isset(self::$built_in_theme_root)) { global $Ktai_Style; self::$built_in_theme_root = WP_PLUGIN_DIR . '/' . $Ktai_Style->get('plugin_dir') . '/' . self::BUILT_IN_THEMES_DIR . '/'; self::$built_in_theme_root_uri = $Ktai_Style->get('plugin_url') . self::BUILT_IN_THEMES_DIR . '/'; } }