~ overflow ~

Problem:

Zend requires registration in order to dowload the free optimizer, it’s annoying and you keep receiving spam.

Solution:

http://downloads.zend.com/optimizer/3.3.3/ZendOptimizer-3.3.3-linux-glibc23-x86_64.tar.gz (linux 64-bit)
http://downloads.zend.com/optimizer/3.3.3/ZendOptimizer-3.3.3-linux-glibc23-i386.tar.gz (linux 32-bit)

neat.

Problem:

Failed loading /usr/local/Zend/lib/Optimizer-3.3.3/php-5.1.x/ZendOptimizer.so:  /usr/local/Zend/lib/Optimizer-3.3.3/php-5.1.x/ZendOptimizer.so: cannot restore segment prot after reloc: Permission denied

Fix:

setenforce 0 (and restart httpd)

and disable SELINUX here:
/etc/selinux/config

SELINUX=disabled

to have this set next time you boot the machine.

Source