APC in PHP 5.5

APC is not available in PHP 5.5, and it’s been replaced by Zend OPcache, which is included and enabled by default in PHP.

Zend OPCache provides increased performance over APC, but it does not include user space caching. If you require this, consider installing APCu

Since it’s now part of PHP’s core, you may want to test you code with Zend’s OPcache first before installing it on a production server.