1：composer create-project laravel/laravel --prefer-dist

Content-Length mismatch, received xxxx bytes out of the expected xxxx

2：配置阿里镜像

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

3：安装lumen

composer global require "laravel/lumen-installer"

4.用lumen创建项目

5：创建遇到问题

composer create-project --prefer-dist laravel/lumen blog

6：执行项目

php -S localhost:8000 -t public