错误提示：
To enable extensions, verify that they are enabled in your .ini files:
- D:\phpstudy_pro\Extensions\php\php7.3.3nts\php.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
解决办法：
*** 在命令后边添加 –ignore-platform-reqs 如下：
composer require laravel/horizon --ignore-platform-reqs