laravel5源码讲解整理

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目录

• 入口文件 index.php
  • Illuminate\Foundation\Application 类
  • 注入所有基础 Service Provider

 

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 <[e-mail]> */ /* |-------------------------------------------------------------------------- | 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

1	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

1	$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 Illuminate\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

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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。

Illuminate\Foundation\Application#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('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#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()，

Illuminate\Foundation\Application#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 \Illuminate\Support\ServiceProvider|string $provider * @param array $options * @param bool $force * @return \Illuminate\Support\ServiceProvider */ public function register($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

• Illuminate\Events\EventServiceProvider
• Illuminate\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#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('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#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 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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