来源：http://yuez.me/laravel-yuan-ma-jie-du/?utm_source=tuicool&utm_medium=referral目录入口文件 index.phpIlluminate\Foundation\application类注入所有基础 ServicePRovider
入口文件 index.php一个基于Laravel的应用，当WEB服务器接受到来自外部的请求后，会将这个这个请求解析到 应用根目录的 public/index.php 中。
Laravel源码解读-index.php (laravel_index.php)download123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657
<?php/*** Laravel - A PHP Framework For Web Artisans** @package Laravel* @author Taylor Otwell <taylorotwell@Gmail.com>*//*|--------------------------------------------------------------------------| Register The Auto Loader|--------------------------------------------------------------------------|| Composer provides a convenient, automatically generated class loader for| our application. We just need to utilize it! We'll simply require it| into the script here so that we don't have to worry about manual| loading any of our classes later on. It feels nice to relax.|*/require__DIR__.'/../bootstrap/autoload.php';/*|--------------------------------------------------------------------------| Turn On The Lights|--------------------------------------------------------------------------|| We need to illuminate PHP development, so let us turn on the lights.| This bootstraps the framework and gets it ready for use, then it| will load up this application so that we can run it and send| the responses back to the browser and delight our users.|*/$app=require_once__DIR__.'/../bootstrap/app.php';/*|--------------------------------------------------------------------------| Run The Application|--------------------------------------------------------------------------|| Once we have the application, we can handle the incoming request| through the kernel, and send the associated response back to| the client's browser allowing them to enjoy the creative| and wonderful application we have prepared for them.|*/$kernel=$app->make(Illuminate\Contracts\Http\Kernel::class);$response=$kernel->handle($request=Illuminate\Http\Request::capture());$response->send();$kernel->terminate($request,$response);
第二十一行代码
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require__DIR__.'/../bootstrap/autoload.php';
为Laravel应用引入了由Composer提供的类加载器，这样Laravel应用便无需再手动加载任 何的类。其加载原理不是此次探究的目标，所以仅仅这样使用就好了。接下的代码，便是重 点。
Illuminate\Foundation\Application 类该类的继承结构如下：
第三十五行代码
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$app=require_once__DIR__.'/../bootstrap/app.php';
它将我的视线引入到了另外一个文件中，去看看到底发生了什么吧。
Laravel源码解读-app.php (laravel_app.php)download12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455
<?php/*|--------------------------------------------------------------------------| Create The Application|--------------------------------------------------------------------------|| The first thing we will do is create a new Laravel application instance| which serves as the "glue" for all the components of Laravel, and is| the IoC container for the system binding all of the various parts.|*/$app=newIlluminate\Foundation\Application(realpath(__DIR__.'/../'));/*|--------------------------------------------------------------------------| Bind Important Interfaces|--------------------------------------------------------------------------|| Next, we need to bind some important interfaces into the container so| we will be able to resolve them when needed. The kernels serve the| incoming requests to this application from both the web and CLI.|*/$app->singleton(Illuminate\Contracts\Http\Kernel::class,App\Http\Kernel::class);$app->singleton(Illuminate\Contracts\Console\Kernel::class,App\Console\Kernel::class);$app->singleton(Illuminate\Contracts\Debug\ExceptionHandler::class,App\Exceptions\Handler::class);/*|--------------------------------------------------------------------------| Return The Application|--------------------------------------------------------------------------|| This script returns the application instance. The instance is given to| the calling script so we can separate the building of the instances| from the actual running of the application and sending responses.|*/return$app;
看第十四行，原来$app是一个 Illuminate\Foundation\Application 对象，那么在创 建这个对象的时候又发生了什么呢？
从它的构造方法看起：
Illuminate\Foundation\Application 构造方法123456789101112131415161718
/*** Create a new Illuminate application instance.** @param string|null $basePath* @return void*/publicfunction__construct($basePath=null){$this->registerBaseBindings();$this->registerBaseServiceProviders();$this->registerCoreContainerAliases();if($basePath){$this->setBasePath($basePath);}}
顺着函数调用，往下看。在这个构造函数中，首先调用了registerBaseBindings方法。
Illuminate\Foundation\Application#registerBaseBindings12345678910111213
/*** Register the basic bindings into the container.** @return void*/protectedfunctionregisterBaseBindings(){static::setInstance($this);$this->instance('app',$this);$this->instance('Illuminate\Container\Container',$this);}
这段代码，是将实例对象注入到容器中。那么，这个容器是什么呢？答案还是要从这段调用 中去寻找。
static::setInstance($this) 所做的就是将 $this 赋值给自身的 instance 静态变 量。重点看 $this->instance('app', $this)。
instance 函数的作用是绑定一个已有对象到容器中，这个对象在容器中共享并且可以通 过键获取。
Illuminate\Container\Container#instance1234567891011121314151617181920212223242526272829
/*** Register an existing instance as shared in the container.** @param string $abstract* @param mixed $instance* @return void*/publicfunctioninstance($abstract,$instance){if(is_array($abstract)){// $abstract 是这样的一个数组 ['actual key' => 'alias']list($abstract,$alias)=$this->extractAlias($abstract);// 实际上的行为是 $this->aliases[$alias] = $abstract;$this->alias($abstract,$alias);}unset($this->aliases[$abstract]);// 检查是否有这个键是否已经注册到容器中// $bound 是一个boolean值$bound=$this->bound($abstract);$this->instances[$abstract]=$instance;if($bound){$this->rebound($abstract);}}
视线重新回到Application类中，接下来调用了这个方法 $this->registerBaseServiceProviders()，
Illuminate\Foundation\Application#registerBaseServiceProviders1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253
/*** Register all of the base service providers.** @return void*/protectedfunctionregisterBaseServiceProviders(){$this->register(newEventServiceProvider($this));$this->register(newRoutingServiceProvider($this));}/*** Register a service provider with the application.** @param \Illuminate\Support\ServiceProvider|string $provider* @param array $options* @param bool $force* @return \Illuminate\Support\ServiceProvider*/publicfunctionregister($provider,$options=[],$force=false){if($registered=$this->getProvider($provider)&&!$force){return$registered;}// If the given "provider" is a string, we will resolve it, passing in the// application instance automatically for the developer. This is simply// a more convenient way of specifying your service provider classes.if(is_string($provider)){$provider=$this->resolveProviderClass($provider);}$provider->register();// Once we have registered the service we will iterate through the options// and set each of them on the application so they will be available on// the actual loading of the service objects and for developer usage.foreach($optionsas$key=>$value){$this[$key]=$value;}$this->markAsRegistered($provider);// If the application has already booted, we will call this boot method on// the provider class so it has an opportunity to do its boot logic and// will be ready for any usage by the developer's application logics.if($this->booted){$this->bootProvider($provider);}return$provider;}
其中，EventServiceProvider和RoutingServiceProvider分别是
Illuminate\Events\EventServiceProviderIlluminate\Routing\RoutingServiceProvider这些ServiceProvider是 Illuminate\Support\ServiceProvider 的子类，它接受一个 Application 对象作为构造函数参数，存储在实例变量 $app 中。
注入所有基础 Service Provider在 register 方法中，每个ServiceProvider被调用了自身的 register 方法。首先看 看 EventServiceProvider 中的吧。
Illuminate\Events\EventServiceProvider#register12345678
publicfunctionregister(){$this->app->singleton('events',function($app){return(newDispatcher($app))->setQueueResolver(function()use($app){return$app->make('Illuminate\Contracts\Queue\Factory');});});}
上面方法体将一个 Illuminate\Events\Dispatcher 对象以键 events 绑定到了容器 中，它负责实现事件的调度。
再看看 Illuminate\Routing\RoutingServiceProvider:
Illuminate\Routing\RoutingServiceProvider#register1234567891011121314
publicfunctionregister(){$this->registerRouter();$this->registerUrlGenerator();$this->registerRedirector();$this->registerPsrRequest();$this->registerPsrResponse();$this->registerResponseFactory();}
首页是在Laravel中接触的最多的 route 被注册，它是 Illuminate\Routing\Router 对象。
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其他好文
http://www.cnblogs.com/wish123/p/4756669.html
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