install composer dependencies
composer install
build docker image (change alpine to 3.8 for php72, 3.10 for php73)
docker build . -t php-pm-test
then
docker run -p 8080:8080 php-pm-test
and now just launch a series of ab against the container
ab -c 1 -n 2000 http://localhost:8080/
it will crash at around 1000 requests (no crash in php 72)