phake\CycleDetector::find_strongly_connected_components PHP Метод

    private function find_strongly_connected_components($first_task)
    {
        $first_marked_node =& $this->mark_node($first_task);
        $this->current_index++;
        $this->visited_nodes->push($first_task);
        foreach ($first_task->get_dependencies() as $name => $second_task) {
            $second_task_key = $this->task_key($second_task);
            if (!$this->has_marked_node($second_task)) {
                $this->find_strongly_connected_components($second_task);
                $second_marked_node =& $this->get_marked_node($second_task);
                $first_marked_node['lowlink'] = min($first_marked_node['lowlink'], $second_marked_node['lowlink']);
            } else {
                if ($this->marked_nodes[$second_task_key]['on_stack'] === true) {
                    $second_marked_node =& $this->get_marked_node($second_task);
                    $first_marked_node['lowlink'] = min($first_marked_node['lowlink'], $second_marked_node['index']);
                }
            }
        }
        if ($first_marked_node['lowlink'] == $first_marked_node['index']) {
            $connected_component = array();
            do {
                $next_node = $this->visited_nodes->pop();
                $next_marked_node =& $this->get_marked_node($next_node);
                $connected_component[] = $next_node;
                $next_marked_node['on_stack'] = false;
            } while ($first_marked_node['task_node'] !== $next_node);
            $this->connected_components[] = $connected_component;
        }
    }