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

Does any of this have some kind of support of existing PHP modules?

thanks for suggestion. looks cool. but as you said far from production ready. we choosed frankenphp since we saw it got support by php foundation.