Additionally: PHP is a beast of a web language. With the upcoming 7.3 release being 200% faster than the 5.6 release performance is only getting better.
It is one of the fastest scripting languages, and it will become even faster when JIT is implemented (like an order of magnitude faster). That won't make a difference in web apps because computing is never the bottleneck (it's usually I/O bound : loading 1000s of classes from your favorite framework and querying an API or SQL server that's not even on the same machine comes at a cost), but it could make PHP usable for domains in which nobody would consider using PHP/Python/Ruby today, like heavy scientific computations, image processing, 3d rendering or IA.
Preloading (coming in 7.4) on the other hand could help quite a bit on the I/O side.
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