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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 Optimizer™ 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.
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.
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:
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