Eccube\ServiceProvider\DebugServiceProvider::boot PHP Method

    public function boot(Application $app)
    {
        // This code is here to lazy load the dump stack. This default
        // configuration for CLI mode is overridden in HTTP mode on
        // 'kernel.request' event
        VarDumper::setHandler(function ($var) use($app) {
            $dumper = new CliDumper();
            $dumper->dump($app['var_dumper.cloner']->cloneVar($var));
        });
        $app['dispatcher']->addSubscriber(new DumpListener($app['var_dumper.cloner'], $app['data_collector.dump']));
    }