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目录
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)download
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<?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(IlluminateContractsHttpKernel::class);
$response = $kernel->handle(
$request = IlluminateHttpRequest::capture()
);
$response->send();
$kernel->terminate($request, $response);
|
第二十一行代码
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require __DIR__.'/../bootstrap/autoload.php';
|
为Laravel应用引入了由Composer提供的类加载器，这样Laravel应用便无需再手动加载任 何的类。其加载原理不是此次探究的目标，所以仅仅这样使用就好了。接下的代码，便是重 点。
IlluminateFoundationApplication 类
该类的继承结构如下：
第三十五行代码
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$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)download
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<?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 = new IlluminateFoundationApplication(
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(
IlluminateContractsHttpKernel::class,
AppHttpKernel::class
);
$app->singleton(
IlluminateContractsConsoleKernel::class,
AppConsoleKernel::class
);
$app->singleton(
IlluminateContractsDebugExceptionHandler::class,
AppExceptionsHandler::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 IlluminateFoundationApplication 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：
IlluminateFoundationApplication 构造方法
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/**
* Create a new Illuminate application instance.
*
* @param string|null $basePath
* @return void
*/
public function __construct($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。
IlluminateFoundationApplication#registerBaseBindings
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/**
* Register the basic bindings into the container.
*
* @return void
*/
protected function registerBaseBindings()
{
static::setInstance($this);
$this->instance('app', $this);
$this->instance('IlluminateContainerContainer', $this);
}
|
这段代码，是将实例对象注入到容器中。那么，这个容器是什么呢？答案还是要从这段调用 中去寻找。
static::setInstance($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。
IlluminateContainerContainer#instance
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/**
* Register an existing instance as shared in the container.
*
* @param string $abstract
* @param mixed $instance
* @return void
*/
public function instance($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()，
IlluminateFoundationApplication#registerBaseServiceProviders
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/**
* Register all of the base service providers.
*
* @return void
*/
protected function registerBaseServiceProviders()
{
$this->register(new EventServiceProvider($this));
$this->register(new RoutingServiceProvider($this));
}
/**
* Register a service provider with the application.
*
* @param IlluminateSupportServiceProvider|string $provider
* @param array $options
* @param bool $force
* @return IlluminateSupportServiceProvider
*/
public function register($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);
}
$provider->register();
// Once we have registered the service we will iterate through the options
// and set each of them on the application so they will be available on
// the actual loading of the service objects and for developer usage.
foreach ($options as $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
IlluminateEventsEventServiceProviderIlluminateRoutingRoutingServiceProvider
这些ServiceProvider是 IlluminateSupportServiceProvider 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。
IlluminateEventsEventServiceProvider#register
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public function register()
{
$this->app->singleton('events', function ($app) {
return (new Dispatcher($app))->setQueueResolver(function () use ($app) {
return $app->make('IlluminateContractsQueueFactory');
});
});
}
|
上面方法体将一个 IlluminateEventsDispatcher 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 IlluminateRoutingRoutingServiceProvider:
IlluminateRoutingRoutingServiceProvider#register
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public function register()
{
$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 IlluminateRoutingRouter 对象。
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其他好文
http://www.cnblogs.com/wish123/p/4756669.html
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