XCache is a fast, stable PHP opcode cacher that has been tested and run on production servers under high load. It supports and is tested on all lastest PHP CVS branches, such as PHP_4_3, PHP_4_4, PHP_5_1, PHP_5_2, and HEAD (6.x). The latest release 1.1.0 introduced partial PHP 5.2 support. The “Cannot redeclare ()” bug, a prototype problem inheriting from an abstract class, reference handling in xcache_set, and many other bugs were fixed.
XCache