``` composer create-project laravel/laravel folder_name //安装laravel的最新版本 composer create-project laravel/laravel folder_name --prefer-dist "5.8.*" //安装laravel的指定版本如5.8 composer install //composer安装 composer install --prefer-dist composer update //更新 composer update package/name composer dump-autoload [--optimize] composer self-update //composer更新自己 composer require [options] [--] [vendor/packages]... // 全局安装 composer require global vendor/packages // 罗列所有扩展包括版本信息 composer show ```