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Download Zend Optimizer from the command line of the server.

wget http://downloadspot.com/downloads/ZendOptimizer-3.3.9-linux-glibc23-i386.tar.gz

Then untar

tar xvfz ZendOptimizer-3.3.9-linux-glibc23-i386.tar.gz

Then enter the Zend directory

cd ZendOptimizer-3.3.9-linux-glibc23-i386/data/

Then find the phpversion match .so file

Copy the full patch to the file:

zend_extension=</root/ZendOptimizer-3.3.9-linux-glibc23-i386/data/5_2_x_comp/ZendOptimizer.so>

Then copy the full path to the file php.ini file located in the /usr/local/lib/ folder:

zend_extension=</root/ZendOptimizer-3.3.9-linux-glibc23-i386/data/5_2_x_comp/ZendOptimizer.so>

Restart Apache