错误代码如下：
Installing dependencies from lock file (including require-dev)Verifying lock file contents can be installed on current platform.Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - league/flysystem is locked to version 1.1.10 and an update of this package was not requested. - league/flysystem 1.1.10 requires ext-fileinfo * -> it is missing from your system. Install or enable PHP's fileinfo extension. Problem 2 - league/mime-type-detection is locked to version 1.11.0 and an update of this package was not requested. - league/mime-type-detection 1.11.0 requires ext-fileinfo * -> it is missing from your system. Install or enable PHP's fileinfo extension. Problem 3 - phpoffice/phpspreadsheet is locked to version 1.26.0 and an update of this package was not requested. - phpoffice/phpspreadsheet 1.26.0 requires ext-fileinfo * -> it is missing from your system. Install or enable PHP's fileinfo extension. Problem 4 - league/flysystem 1.1.10 requires ext-fileinfo * -> it is missing from your system. Install or enable PHP's fileinfo extension. - league/flysystem-aws-s3-v3 1.0.30 requires league/flysystem ^1.0.40 -> satisfiable by league/flysystem[1.1.10]. - league/flysystem-aws-s3-v3 is locked to version 1.0.30 and an update of this package was not requested.To enable extensions, verify that they are enabled in your .ini files: - D:\myphp\php.iniYou can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode.Alternatively, you can run Composer with `--ignore-platform-req=ext-fileinfo` to temporarily ignore these required extensions.解决方案：
修改安装的 php 目录下，php.ini 解开 extension=fileinfo 的注释，去点前面的分号即可
修改完后，在执行 composer install 命令，可能有两种情况如下：
- 执行成功，可以进行下一步
- 还出现错误，错误代码如下：
Installing dependencies from lock file (including require-dev)Verifying lock file contents can be installed on current platform.Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - phpoffice/phpspreadsheet is locked to version 1.26.0 and an update of this package was not requested. - phpoffice/phpspreadsheet 1.26.0 requires ext-gd * -> it is missing from your system. Install or enable PHP's gd extension.To enable extensions, verify that they are enabled in your .ini files: - D:\myphp\php.iniYou can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode.Alternatively, you can run Composer with `--ignore-platform-req=ext-gd` to temporarily ignore these required extensions.解决方案如下：
执行下面命令：composer install --ignore-platform-req=ext-gd
执行后就成功了！！！
来源地址：https://blog.csdn.net/weixin_43132073/article/details/131330128
