初始化composer仓库 composer init 然后编写compoer.json ``` { "name": "simple/simple-php", "description": "simple php frame", "type": "project", "license": "MIT", "minimum-stability": "dev", "require": { "php": ">=7.0.0" }, "autoload": { "psr-4": { "SimplePHP\\" : "Simple/" } } } ``` 执行composer install进行安装