执行composer install后报错：执行composer install后报错： d11wtq/boris v1.0.10 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system.

执行composer install后报错：

1. d11wtq/boris v1.0.10 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system.
2. d11wtq/boris v1.0.10 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system.
3. Installation request for d11wtq/boris v1.0.10 -> satisfiable by d11wtq/boris[v1.0.10].

When I run command: composer install it creating error.

And also how to install extension on php.init.

解决办法：

composer update --ignore-platform-reqs