To confirm the requirements in terms of PHP, the easiest way is to create a file called info.php on the website structure featuring: phpinfo();
When accessing this URL, you will be able to see the server's PHP configuration.
By completing this step, you can access the box above "PHP Credits" (box with Zend's logo) and the following information:
This program makes use of the Zend Scripting Language Engine:
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
with eAccelerator v0.9.5.3, Copyright (c) 2004-2006 eAccelerator, by eAccelerator
with the ionCube PHP Loader v3.1.34, Copyright (c) 2002-2009, by ionCube Ltd., and
with Zend Extension Manager v1.2.2, Copyright (c) 2003-2007, by Zend Technologies
with Zend Optimizer v3.3.3, Copyright (c) 1998-2007, by Zend Technologies
So, this server (example) has Zend Optimizer v3.3.3.