so here it is
So, how fast will my website run if this is completed?
The truth is that I lack the benchmarks to be able to answer that right now. The core of the PHP language is implemented up to the point where I’m confident that the performance will not change as we get more of the PHP going.
How do I run it?
Get a PyPy checkout, apply the diff if you want to squeeze out the last bits of performance and run pypy-checkout/pypy/bin/rpython targethippy.py to get an executable that resembles a PHP interpreter. You can also directly run python targethippy.py file.php, but this will be about 2000x slower.