src/Core/Controller.php
public function get($key, $default = null, $deep = false)
    {
        return $this->getRequest()->get($key, $default, $deep);
    }
public function get($key, $default = null, $deep = false)
    {
        return $this->getRequest()->get($key, $default, $deep);
    }
Get "parameter" value. Order: GET, PATH, POST, COOKIE

@param string $key
@param mixed $default
@param boolean $deep

@return mixed