gistfile1.php

class TasksWorkerFactory {
    public function getWorker(Task $task){
        $task_type = get_class($task);
        if(!array_key_exists($task_type, self::$map))
            throw new \Exception;
        /** @var AbstractWorker $worker */
        $worker = new self::$map[$task_type];
        $worker->setTask($task);
        return $worker;
    }

    protected static $map = [
        'Move' => '',
        'Mining' => '',
        'BuildingConstructing' => '',
        'RoadConstructing' => '',
        'Manufactoring' => ''
    ];
}