Laravelカーネルのインスタンス化について解説した記事

// \Illuminate\Contracts\Http\Kernel 类构造器依赖 \Illuminate\Contracts\Foundation\Application 和 \Illuminate\Routing\Router，将会通过服务容器来处理依赖关系
public function __construct(Application $app, Router $router)
{
    $this->app = $app;

    // 主要委托 $router 来处理
    $this->router = $router;
    // 以下均为中间件的设置
    $router->middlewarePriority = $this->middlewarePriority;

    foreach ($this->middlewareGroups as $key => $middleware) {
        $router->middlewareGroup($key, $middleware);
    }

    foreach ($this->routeMiddleware as $key => $middleware) {
        $router->aliasMiddleware($key, $middleware);
    }
}

\Illuminate\Contracts\Foundation\Application 的处理：
make 时通过别名方式直接调用 $this->instances['app']

\Illuminate\Routing\Router 的处理:
make 时通过别名方式直接调用 $this->bindings['router'] 数组里面 concrete 对应的匿名函数
Router 依赖 \Illuminate\Contracts\Events\Dispatcher 和 \Illuminate\Container\Container
public function __construct(Dispatcher $events, Container $container = null)
{
    $this->events = $events;
    $this->routes = new RouteCollection;
    $this->container = $container ?: new Container;
}

\Illuminate\Contracts\Events\Dispatcher 的处理：
make 时通过别名方式直接调用 $this->bindings['events'] 数组里面 concrete 对应的匿名函数
Dispatcher 依赖 \Illuminate\Contracts\Container\Container
public function __construct(ContainerContract $container = null)
{
    $this->container = $container ?: new Container;
}

\Illuminate\Container\Container 的处理:
make 时直接调用 $this->instances['Illuminate\Container\Container'] = Object(app)
\Illuminate\Contracts\Container\Container 的处理:
make 时调用别名直接调用 $this->instances['app'] = Object(app)
上面两个一样，没有区别

##############################################
if ($concrete instanceof Closure) {            
    return $concrete($this, end($this->with)); 
}
###############################################

$this->bindings['router'] = [
        'concrete' => function ($app) {
                            return new Router($app['events'], $app);
                        },
        'shared' => 'true',
    ];
$router = new Router($app['events'], $app);

\Illuminate\Routing\Router
public function __construct(Dispatcher $events, Container $container = null)
{
    $this->events = $events;
    $this->routes = new RouteCollection;
    $this->container = $container ?: new Container;
}

$this->bindings['events'] = [
    'concrete' => function ($app) {
            return (new Dispatcher($app))->setQueueResolver(function () use ($app) {
                return $app->make(QueueFactoryContract::class);
            });
            }
    'shared' => 'true',
];

$dispatcher = (new \Illuminate\Events\Dispatcher($app))->setQueueResolver(function () use ($app) {
                return $app->make(QueueFactoryContract::class);
            });

Illuminate\Events\Dispatcher:
public function __construct(ContainerContract $container = null)
{
    $this->container = $container ?: new Container;
}
public function setQueueResolver(callable $resolver)
{
    $this->queueResolver = $resolver;

    return $this;
}