http://www.php.net/manual/en/function.apc-fetch.php
http://devzone.zend.com/1812/using-apc-with-php/
http://www.if-not-true-then-false.com/2012/php-apc-configuration-and-usage-tips-and-tricks/
http://techportal.inviqa.com/2010/10/07/understanding-apc/
http://en.wikipedia.org/wiki/HipHop_for_PHP
http://www.howtoforge.com/apc-php5-apache2-debian-etch
http://css.dzone.com/articles/apc-caching-php
