why does laravel artisan stop working code example

Example 1: php artisan serve

The full command works like this:

php artisan serve --host=<host IP address> --port=<port to use>

php artisan serve --host=127.0.0.1 --port=8080

Example 2: php artisan serve

// run laravel project 
php artisan serve --port="port" --host="host"