At first blush, it didn't seem implausible to write a ZeroMQ SAPI, like PHP-FPM, or to modify an existing SAPI (e.g. FPM) to consume ZeroMQ sockets. I was actua

At first blush, it didn't seem implausible to write a ZeroMQ SAPI, like PHP-FPM, or to modify an existing SAPI (e.g. FPM) to consume ZeroMQ sockets. I was actually really excited to see where people would take that. What I realized later was that it didn't happen because a lot of PHP is deployed to shared/managed hosts, and people willing/able to deploy code like Mongrel2 are unlikely to be using PHP. The venn diagram of 'people capable of building out a PHP SAPI' and 'people interested in bleeding-edge experimentation like Mongrel2' doesn't overlap enough to produce results.