Your requirements could not be resolved to an installable set of packages.
Problem 1
- phpoffice/phpspreadsheet 1.10.1 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
- phpoffice/phpspreadsheet 1.10.1 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
- Installation request for phpoffice/phpspreadsheet (installed at 1.10.1) -> satisfiable by phpoffice/phpspreadsheet[1.10.1].
To enable extensions, verify that they are enabled in your .ini files:
- /www/server/php/72/etc/php.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
Installation failed, reverting ./composer.json to its original content.
原因：缺少fileinfo扩展
解决办法：找度娘，安装完扩展后
执行安装：
composer require phpoffice/phpspreadsheet=1.10.1
等待成功，然后在执行
composer require workerman/gateway-worker
完成。
composer require workerman/gateway-worker时报错
原文：https://www.cnblogs.com/j-jian/p/13234333.html