1. Download Zend in the server you want to install.
Linux 32b - http://downloads.zend.com/optimizer/3.3.9/ZendOptimizer-3.3.9-linux-glibc23-i386.tar.gz
Linux 64b - http://downloads.zend.com/optimizer/3.3.9/ZendOptimizer-3.3.9-linux-glibc23-x86_64.tar.gz
2. Untar it. # tar -xvf ZendOptimizer-3.3.9-linux-glibc23-i386.tar.gz
3. Change to the directory where you have extracted it.
4. Copy the file ZendOptimizer.so from the folder with your php version number to an easy to use path like /var/ or /usr/
5. Open your php.ini and add this line: zend_extension=
6. Restart your webserver.
NOTE: if it doesnt load, try disabling selinux, see disable selinux article.
