This is an example of nginx and php7 with xdebug enabled, so you can start debug session with PHPStorm, put a breakpoint in ./public/index.php and stop there.
If you under WSL than you need to specify client_host as host.docker.internal inside xdebug.ini file.
See ./docker/php/xdebug.ini file for details.
After changes in any php config file (e.g. ./docker/php/xdebug.in) it needs to be restarted. Since we are using php-fpm container here,
we need to reload php-fpm not the web server:
inside php container:
ps aux -- find master php-fpm process
kill -USR2 {number_of_master_process}
Run:
docker compose up -d
Then check if two services are run and their status is Up:
docker ps
Put breakpoint in ./docker/public/index.php. Create remote debug connection in PHPStorm. It should be enough for the debugger to stop.