If zend is a probelm and httpd is not restarting then download and install the latest from:
http://downloads.zend.com/optimizer
At the time of this writing, this little script worked like a charm:
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cd /root
deltree -f Zend*
wget http://downloads.zend.com/optimizer/3.3.9/ZendOptimizer-3.3.9-linux-glibc23-i386.tar.gz
tar -xzvf ZendOptimizer-3.3.9-linux-glibc23-i386.tar.gz
cd Zend*
./install.sh
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