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.
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.
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