Пакет php5-apcu: Информация

PHP extension APCu is an APC stripped of opcode caching in
preparation for the deployment of Zend Optimizer+ as the
primary solution to opcode caching in future versions of PHP.

APCu only supports userland caching (and dumping) of variables,
providing an upgrade path for the APC users. The tried and
tested APC codebase provides far superior support for local
storage of PHP variables.