This first release of pthreads v3 represents a giant leap forwards in efficiency for pthreads, and targets PHP7 only. A summary of changes can be found in the readme, they are further explained in the following blogs posts: * [A Letter from the Future](http://blog.krakjoe.ninja/2015/08/a-letter-from-future.html) * [Addendum for Letter from the Future](http://blog.krakjoe.ninja/2015/09/addendum-letter-from-future.html) The documentation is not yet updated in the PHP manual, if you feel like volunteering to help with that, please do.