创建Laravel项目
composer create-project laravel/laravel firstLaravel
启动项目
方法1
php -S localhost:8888 -t public
方法2
php artisan serve
在创建项目时遇到problem：
Your requirements could not be resolved to an installable set of packages.
Problem 1 - laravel/framework v5.6.9 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
Problem 1 - phpunit/phpunit 4.8.9 requires ext-dom * -> the requested PHP extension dom is missing from your system.
……
解决办法：
安装mbstring和dom扩展包即可：
sudo apt-get install php-mbstring
sudo apt-get install php-xml
