Follow these steps after completing XAMPP installation:
Write :/opt/lampp/bin/php before ending the " double quotation mark and save.
sudo ln -s /opt/lampp/bin/php /usr/local/bin/php
Now run xampp, sudo /opt/lampp/lampp start
Now installing Composer:
curl https://getcomposer.org/installer | php
sudo mv composer.phar /usr/local/bin/composer
Now create a new project:
composer create-project --prefer-dist laravel/laravel myapp "5.8.*"
cd myapp
php artisan serve
Now open browser and go to localhost:8000
php artisan serve
Now open browser and go to localhost:8000