错误提示:laravel/horizon v1.4.3 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system 解决办法: 在 composer.json 中增加 “config”: { “preferred-install”: “dist”, “sort-packages”: true, “optimize-autoloader”: true, “platform”: { “ext-pcntl”: “7.2”, “ext-posix”: “7.2” } },