- laravel/horizon[v5.7.0, ..., 5.x-dev] require ext-pcntl * -> it is missing from your system. Install or enable PHP's pcntl extension. - Root composer.json requires laravel/horizon ^5.7 -> satisfiable by laravel/horizon[v5.7.0, ..., 5.x-dev].
"config": { "optimize-autoloader": true, "preferred-install": "dist", "sort-packages": true, "platform": { "ext-pcntl": "7.2", "ext-posix": "7.2" } },2)安装
composer install