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laravel5源码讲解整理

作者:用户 来源:互联网 时间:2017-12-01 18:31:14

源码

laravel5源码讲解整理 - 摘要: 本文讲的是laravel5源码讲解整理, 来源:http://yuez.me/laravel-yuan-ma-jie-du/?utm_source=tuicool&utm_medium=referral 目录 入口文件 index.php Illuminate/Found

来源:http://yuez.me/laravel-yuan-ma-jie-du/?utm_source=tuicool&utm_medium=referral

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 <[email protected]> *//*|--------------------------------------------------------------------------| 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:

laravel5源码讲解整理

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.|*/$app = new Illuminate/Foundation/Application(    realpath(__DIR__.'/../'));/*|--------------------------------------------------------------------------| Bind Important Interfaces|--------------------------------------------------------------------------|| Next, we need to bind some important interfaces into the container so| we will be able to resolve them when needed. The kernels serve the| incoming requests to this application from both the web and CLI.|*/$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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