OXID eShop and PHP Zend Guard
Zend Guard Reader still doesn’t support PHP 5.3.x. That’s why we decided to abandon the Zend Guard encryption from our products.
Zend
PHP 5.3.0 and Zend Guard / Zend Optimizer
If you are using Zend Guard to encrypt your PHP applications, you probably don’t want to update your server environment to PHP 5.3.0: Zend Guard (for encoding your PHP files) and Zend Optimizer (for decoding your PHP files) are not yet available for this PHP version and so upgrading should break your application.