Thinkphp完全开发手册地址：https://www.kancloud.cn/manual/thinkphp5/118006
1、安装扩展
mbstring扩展：sudo apt-get install php7.2-mbstring
2、安装composer
curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer
3、下载thinkphp5
cd /var/www/html
composer create-project topthink/think=5.0.* thinkphpdemo --prefer-dist
除了上述方法外，也可以通过git下载thinkphp5
git clone https://github.com/top-think/think thinkphpdemo
cd thinkphpdemo
git clone https://github.com/top-think/framework thinkphp
cd thinkphp
git pull https://github.com/top-think/framework