The Zend optimizer is a encoding feature which process where the PHP source code is converted in to the intermediate machine readable format. Such format is really very hard for the humans to read and convert back in to the source code therefore no one can use the side code to redevelop the new site by using the same content.
To install the zend optimizer login in to the server as a root user and run the following script, it will install the script within few minutes.
/scripts/installzendopt
You done it…