List process && listening port and kill them

ps -ef | grep php

List process using ps -ef | grep php

Then below only works for me

kill -9 9347

which is a force kill of the process

501  9347   393   0  1:29PM ttys000    0:00.21 php artisan serve

https://stackoverflow.com/questions/27900174/artisan-error-failed-to-listen-on-localhost8000