Inspired by awesome nikic aticle, and is developed primaraly for the sake of learing a concept of coroutine in php, at this stage it is not for production at all.

composer require --dev zavalit/corouser:dev-master

vendor/bin/server 8081 

In example above 8081 is your port number and you are shurely free to choose any other port you wish

It can be obviously the case that you don't have php version >=5.5, in that case you can run it simply within docker container that has it.

#get the code
git clone https://github.com/zavalit/corouser.git

#go to the source code
cd corouser

#and run a container
docker run -d -p 8081:8081 -v $PWD:/var/www  zavalit/corouser

in a browser

http://localhost:8081

or benchmark it

ab -n 10000 -c 1000 http://0.0.0.0:8081/