@ramsey@krinkle I think this article really nails it down with its conclusion:
"PHP hits a certain Goldilocks sweetspot. It is pretty fast, has a large community for productivity, features modern syntax, is actively developed, easy to learn, easy to scale, and has a large standard library. It offers high and safe concurrency at scale, yet without async complexity or blocking a main thread. It also tends to carry low maintenance cost due to a stable platform, [...] and low dependency count."