How To Build PHP 5.5 (PHP-FPM & FastCGI) With ionCube Loader, Zend OPcache And APCu For ISPConfig 3 (Debian Wheezy) | HowtoForge – Linux Howtos and Tutorials – http://www.howtoforge.com/how-to-build-php-5.5-php-fpm-and-fastcgi-with-ioncube-loader-zend-opcache-and-apcu-for-ispconfig3-debian-wheezy
This lays out the details for building an advanced instance of PHP. Steps are run on Wheezy but may work elsewhere.