How can I solve "laravel/horizon v1.1.0 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system"?

Run composer with the --ignore-platform-reqs option and specify pcntl and posix

composer install --ignore-platform-reqs

As per the accepted answer, but you can add this to your composer.json so that you don't have to run --ignore-platform-reqs all the time

"config": {
  "platform": {
    "ext-pcntl": "8.0",
    "ext-posix": "8.0"
  }
}

install horizon this way :

composer require laravel/horizon --ignore-platform-reqs

then run

php artisan horizon:install

pcntl extension is not supported on Windows. (based on your XAMPP information)

Please see these github issues on laravel/horizon page #131, #78.

I suggest you use Laravel Homestead on your Windows system, It is easy to setup and will save you from many of the similar problems in future.

If you are using docker based on a Unix image you can add it with the docker utility:

docker-php-ext-install pcntl

You can then confirm that this extension is installed and enabled inside of your container:

?> php -i | grep pcntl
/usr/local/etc/php/conf.d/docker-php-ext-pcntl.ini,
pcntl
pcntl support => enabled

Just run the following:

composer install --ignore-platform-reqs

Note: pcntl is not supported on Windows

This works for me

composer require laravel/horizon --ignore-platform-reqs

Hopefully it will help.

I have installed PHP 7.2 instead of 7.1 and everything works fine now. It appears that pcntl was not present in 7.1 but it's installed with php 7.2.

I have some problem and composer install --ignore-platform-reqs works for me

Thanks

If you're running on windows 10 without homestead you can enable the linux subsystem and run horizon through that.

https://www.windowscentral.com/how-install-bash-shell-command-line-windows-10

Then install the requirements

sudo apt install php7.2-fpm php7.2-mbstring php7.2-xmlrpc php7.2-soap php7.2-gd php7.2-xml php7.2-cli php7.2-zip php7.2-mysql

This also can run laravel envoy too which doesn't work on windows.

It's a nice lightweight solution

$composer install --ignore-platform-reqs ext-pcntl

The answer to simply ignore the dependency is wrong. That isn't going to give you a working version of Horizon or whatever package you may be hoping to install. The dependencies must be installed.

Examples of how to install:

APK

sudo add php8-pcntl php8-pcntl

Yum

sudo yum install -y php-pcntl php-posix

add this line

RUN docker-php-ext-install pcntl before

RUN composer install