安装laravel8 命令如下：
sudo composer create-project --prefer-dist laravel/laravel=8 laravel8-email-app
完整代码流程
sudo composer create-project --prefer-dist laravel/laravel=8 laravel8-email-app
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Continue as root/super user [yes]? yes
Creating a "laravel/laravel=8" project at "./laravel8-email-app"
Installing laravel/laravel (v8.0.0)
- Installing laravel/laravel (v8.0.0): Extracting archive
Created project in /www/wwwroot/laravel8.yshuq.com/laravel8-email-app
> @php -r "file_exists('.env') || copy('.env.example', '.env');"
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> 64 package suggestions were added by new dependencies, use `composer suggest` to see details.
> Package fruitcake/laravel-cors is abandoned, you should avoid using it. No replacement was suggested.
> Package swiftmailer/swiftmailer is abandoned, you should avoid using it. Use symfony/mailer instead.
> Package fzaninotto/faker is abandoned, you should avoid using it. No replacement was suggested.
> Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi
> Discovered Package: facade/ignition
> Discovered Package: fideloper/proxy
> Discovered Package: fruitcake/laravel-cors
> Discovered Package: laravel/tinker
> Discovered Package: nesbot/carbon
> Discovered Package: nunomaduro/collision
> Package manifest generated successfully.
> 77 packages you are using are looking for funding.
> Use the `composer fund` command to find out more!
> No security vulnerability advisories found
> @php artisan key:generate --ansi
> Application key set successfully.