Howtoforge posted a guide about integrating APC (Alternative PHP Cache) into PHP5 (Fedora 13 and Apache2)

This guide explains how to integrate APC (Alternative PHP Cache) into PHP5 on a Fedora 13 system (with Apache2). APC is a free and open PHP opcode cacher for caching and optimizing PHP intermediate code. It's similar to other PHP opcode cachers, such as eAccelerator and XCache.

  Integrating APC (Alternative PHP Cache) Into PHP5 (Fedora 13 and Apache2)