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Laravel创建项目报require ext-fileinfo错误

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调用laravel new myapp创建项目时报错:

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 _                               _
| |                             | |
| |     __ _ _ __ __ ___   _____| |
| |    / _` | '__/ _` \ \ / / _ \ |
| |___| (_| | | | (_| |\ V /  __/ |
|______\__,_|_|  \__,_| \_/ \___|_|

    Creating a "laravel/laravel" project at "./myapp1"
    Installing laravel/laravel (v8.4.2)
  - Installing laravel/laravel (v8.4.2): Extracting archive
    Created project in D:\workspace\php/myapp1
> @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[v8.12.0, ..., 8.x-dev] require league/flysystem ^1.1 -> satisfiable by league/flysystem[1.1.0, ..., 1.x-dev].
    - league/flysystem[1.1.0, ..., 1.x-dev] require ext-fileinfo * -> it is missing from your system. Install or enable PHP's fileinfo extension.
    - Root composer.json requires laravel/framework ^8.12 -> satisfiable by laravel/framework[v8.12.0, ..., 8.x-dev].

To enable extensions, verify that they are enabled in your .ini files:
    - D:\Program Files\php\7.3\php.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

解决方法：
出现此错误的原因是php.ini中的fileinfo扩展没有开启，开启 extension=fileinfo，再重新执行命令安装就可以了。