Bolt\Routing\CallbackResolver::convertCallback PHP Method

    public function convertCallback($name)
    {
        if (is_array($name)) {
            list($cls, $method) = $name;
            if (is_array($method)) {
                $params = $method;
                $callback = $this->resolveCallback($cls);
                return function () use($callback, $params) {
                    return call_user_func_array($callback, $params);
                };
            }
        } elseif (strpos($name, '::') > 0) {
            $parts = explode('::', $name);
            $cls = reset($parts);
            $method = end($parts);
        } else {
            return parent::convertCallback($name);
        }
        if (isset($this->classmap[$cls])) {
            $service = $this->classmap[$cls];
            return parent::convertCallback("{$service}:{$method}");
        }
        return [$this->instantiateClass($cls), $method];
    }