curl -sS getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer

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

composer create-project topthink/think think6

<?php
// 全局中间件定义文件
return [
    // 全局请求缓存
    // \think\middleware\CheckRequestCache::class,
    // 多语言加载
    // \think\middleware\LoadLangPack::class,
    // Session初始化
     \think\middleware\SessionInit::class
];

<?php
namespace app\controller;

use app\BaseController;


class Index extends BaseController
{
    public function index()
    {
        $a = isset($_GET['a']) && !empty($_GET['a']) ? $_GET['a'] : '';
        $b = isset($_GET['b']) && !empty($_GET['b']) ? $_GET['b'] : '';
        session($a,$b);
        return '<style type="text/css">*{ padding: 0; margin: 0; } div{ padding: 4px 48px;} a{color:#2E5CD5;cursor: pointer;text-decoration: none} a:hover{text-decoration:underline; } body{ background: #fff; font-family: "Century Gothic","Microsoft yahei"; color: #333;font-size:18px;} h1{ font-size: 100px; font-weight: normal; margin-bottom: 12px; } p{ line-height: 1.6em; font-size: 42px }</style><div style="padding: 24px 48px;"> <h1>:) </h1><p> ThinkPHP V6<br/><span style="font-size:30px">13载初心不改 - 你值得信赖的PHP框架</span></p></div><script type="text/javascript" src="https://tajs.qq.com/stats?sId=64890268" charset="UTF-8"></script><script type="text/javascript" src="https://e.topthink.com/Public/static/client.js"></script><think id="eab4b9f840753f8e7"></think>';
    }

    public function hello($name = 'ThinkPHP6')
    {
        return 'hello,' . $name;
    }
}