執行

composer create-project laravel/laravel laravel9

報錯

Creating a "laravel/laravel" project at "./laravel9"
Installing laravel/laravel (v10.2.1)
  - Downloading laravel/laravel (v10.2.1)
  - Installing laravel/laravel (v10.2.1): Extracting archive
Created project in /Users/xuweidong/www/laravel9
> @php -r "file_exists('.env') || copy('.env.example', '.env');"
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - laravel/framework[v10.10.0, ..., v10.10.1] require doctrine/inflector ^2.0.5 -> found doctrine/inflector[2.0.x-dev, 2.1.x-dev] but it does not match your minimum-stability.
    - Root composer.json requires laravel/framework ^10.10 -> satisfiable by laravel/framework[v10.10.0, v10.10.1].

解決方法：解除鏡像

查看鏡像源

composer config -l -g

[repositories.packagist.org.type] composer
[repositories.packagist.org.url] https://mirrors.aliyun.com/composer/

解除鏡象：並恢復到 packagist 官方源

composer config -g --unset repos.packagist

成功安裝