private static function _exists() { if (self::$_seal) { return true; } $file = Wpjb_List_Path::getPath("seal_file"); if (file_exists($file)) { $contents = file_get_contents($file); self::$_seal = unserialize(base64_decode($contents)); } if (is_array(self::$_seal) && count(self::$_seal) >= 4) { return true; } return false; }