The Rise of Hybrid PHP: Blending PHP with Go and Rust

Pasir is like frankenphp, but in Rust. Very promising, but still early in development:

https://github.com/el7cosmos/pasir

Which uses the following Zend API bindings for Rust:

https://github.com/davidcole1340/ext-php-rs

There's also all sorts of interesting experiments, like ngx-php, which basically embeds PHP via Zend API inside an nginx binary: https://github.com/rryqszq4/ngx-php

And workerman, which has a hybrid backend of asio libraries, so you can get pretty fast runtimes: https://github.com/walkor/workerman