Requirements

Ratchet for CakePHP has a few requirements to work.

PHP 5.4+

This plugin is written to work with PHP 5.4 and up.

PHP PCNTL Extension

Intercepts signals from the OS.

CakePHP 2.x

While a CakePHP plugin obviously requires CakePHP if you want to use Ratchet as a standalone tool check out it's website.

Composer

Composer is a packagemanager for PHP. Ratchet uses it to fetch all it's dependencie with it. (Read more here on Composer and CakePHP 2.x.)

SSH/Shell access

Ratchet requires to be ran as background service and can't be run using a HTTP server like Apache or NGINX. This is because Ratchet is a long running process. It's reccomended to use a tool like supervisord to keep an eye on it.

ext-libevent

While not required it is highly reccomended to install ext-libevent for better performence.