The MongoDB blog has a new post asking for feedback on what the user community thinks of their approach to supporting MongoDB functionality in PHP 5.x, HHVM and even out to PHP7.
Since the PHP driver first appeared on the scene, MongoDB has gone through many changes. [...] Beyond MongoDB's features, our ecosystem has also changed. [...] During the spring of 2014, we worked with a team of students from Facebook's Open Academy program to prototype an HHVM driver modeled after the 1.x API.
[...] Although the final result was not feature complete, the project was a valuable learning experience. The C driver proved quite up to the task, and HNI, which allows an HHVM extension to be written with a combination of PHP and C++, highlighted critical areas of the driver for which we'd want to use C. This all leads up to the question of how best to support PHP 5.x, HHVM, and PHP 7.0 with our next-generation driver.
They've shared the overview of the new driver structure including three layers: the system level functionality, the extensions themselves and a MongoDB userland library. They walk through the thinking on each of the pieces of the puzzle and how they all couple together to make for a more robust, flexible system that's also easy to use.