Explore the latest features and improvements in PHP 5.5 and the upcoming PHP 5.6 in this conference talk from PHP UK Conference 2014. Dive into new additions like generators, coroutines, the finally construct, and simple password hashing. Learn about upcoming changes such as variadic functions and the splat operator. Gain insights into future-proofing legacy code and leveraging new capabilities in your projects. Discover additional topics including power constants, debug info, GMP improvements, importing namespaces, and function syntax enhancements. Get a glimpse of what's on the horizon for PHP, including discussions on React, Promises, performance improvements, and potential future versions like PHP 6 and beyond.