History: OPcache
Preview of version: 4
Tiki12
Added in Tiki12: OPcache stats are shown in Performance admin panel.
How to install with ClearOS: http://wikisuite.org/How-to-install-PHP-5-6-on-ClearOS#Recommended_OPcache
Related:
http://thephp.cc/viewpoints/blog/2013/06/php-5-5-out-of-the-box-bytecode-cache