Tp5.1 安装要求：
PHP >= 5.6.0 PDO PHP Extension MBstring PHP Extension
Composer镜像：
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
Composer安装：
composer create-project topthink/think=5.1.* tp5
Nginx伪静态配置：
if (!-e $request_filename) {
rewrite ^(.*)$ /index.php?s=$1 last;
break;
}安装参考：https://www.kancloud.cn/manual/thinkphp5/118006
目录参考：https://www.kancloud.cn/manual/thinkphp5_1/353950