This is a simple command to stop an abandoned laravel server in php composer. If you made the mistake of closing the terminal or visual code for example while running a laravel application, this is what way you can stop it from serving port 8000.
Find the PID running port 8000:
lsof -i :8000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
php7.4 13657 developer 6u IPv4 90120 0t0 TCP localhost:8000 (LISTEN)
Once you have the PID number, you can kill it with super user:
sudo kill -9 [PID]
Open your broswer again to http://localhost:8000 you will get an error as its not running anymore