Recently I upgraded PHP 5.2 to PHP 5.3 on a CentOS Linux server because of a PHP 0day and noticed an error complaining about ZendOptimizer-5.3.so which is the library loaded into PHP. After some research I found out that it doesn’t look like Zend Optimizer is available for PHP 5.3 on CentOS Linux and will not be available for PHP 5.3 period. Not a big deal in my scenario as I was using it as well as PHP eAccelerator. This error is easily resolved as long as you do not require the php-zend-optimizer package so if that is the case follow the directions below to resolve the error.

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