Do I use Zend Optimizer or Zend Guard Loader?

Zend Optimizer


Zend Optimizer is now obsolete because it's included in PHP 5.3 and later. It is made available free of charge to users of earlier versions of PHP.

Zend Optimizer is loaded as a PHP engine extension. This extension,
automatically optimizes PHP scripts, and transparently detects and loads
encoded files. The Zend Optimizerâ„¢ boosts PHP performance by going over the intermediate code generated by the standard Zend run-time compiler andoptimizing it for faster execution. In addition, it runs the files encoded by Zend Guard, while enhancing the running speed of PHP applications.

Download Zend Optimizer free of charge here >

Get the User Guide >

Zend Guard Loader (for PHP 5.3 and 5.4)


Zend Guard Loader is a free runtime application that enables PHP to run the scripts encoded by Zend Guard. It can be used freely by anyone looking to run encoded applications.

Download Zend Guard Loader free of charge, here >



Looking to run an application encoded by Zend Guard?

The simplest way to set up a PHP runtime environment that can execute scripts protected by Zend Guard is to install Zend Server, our pre-integrated PHP application stack. It includes:

  • Zend Guard Loader extension
  • Application performance optimization
  • Application monitoring

Download your free Trial today!

Free Zend Server Trial