Starting with PHP 5.5.0, an opcode cache and optimizer module called Zend Opcache is bundled with PHP. It is intended to be the first choice in opcode caches, making APC and friends obsolete.
Zend Opcache is not bundled with PHP 5.4, but it is available and works with 5.4 too. You can get it from PECL and build it yourself. If you run Debian Wheezy, which ships with PHP 5.4.4, you can also install Zend Opcache from debian.dev-zero.nl.
Php5-zendopcache-7.0.3-1tzz3 is available (amd64 only) in wheezy-custom.
