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屡屡碰壁，安装一个项目，发现没有依赖，需要使用composer安装，没接触过，找了网上也没攻略，自己弄了后有以下问题，经过调整解决了：
报错1:没有安装fileinfo扩展
Loading composer repositories with package information Updating dependencies Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires alipaysdk/easysdk 2.0 -> satisfiable by alipaysdk/easysdk[2.0.0]. - alipaysdk/easysdk 2.0.0 requires ext-fileinfo * -> it is missing from your system. Install or enable PHP's fileinfo extension. Problem 2 - topthink/think-filesystem[v1.0.0, ..., v1.0.3] require league/flysystem ^1.1.4 -> satisfiable by league/flysystem[1.1.4, ..., 1.1.10]. - league/flysystem[1.1.0, ..., 1.1.10] require ext-fileinfo * -> it is missing from your system. Install or enable PHP's fileinfo extension. - Root composer.json requires topthink/think-filesystem ^1.0 -> satisfiable by topthink/think-filesystem[v1.0.0, v1.0.1, v1.0.2, v1.0.3]. To enable extensions, verify that they are enabled in your .ini files: - /www/server/php/82/etc/php.ini You 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. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions. 2、删除禁用函数puv
3.其他报错信息，请自己翻译，整改好重新运行即可，我这里没留存其他报错信息了
成功安装
