Re:Mastering PHP – Free book on good modern PHP practices
by SergeyPopoff on Monday October 12, 2015 @10:38AM
(#10374759)
Wow, SIMD.js looks neat, thank you for pointing me to this! They even has Intel involved with this.
WebAssembly looks very very promising too.
After that tweaking, I think you might be interested in SIMD for Javascript and hopefully, WebAssembly will make PHP even speedier performance.