Discover the latest advancements in HHVM's PHP compatibility and future developments in this informative talk from Meta software engineers Sara Golemon and Paul Tarjan. Explore topics such as the inbuilt web server, packages, frameworks, and upcoming projects. Gain insights into open source contributions, writing extensions, and the open development process for HHVM. Learn about the significant progress made in the past year and get a glimpse of what's to come in this comprehensive update on HHVM's open source journey.