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laravel5源码讲授整理

WBOY원래의: 2016-06-13 12:27:34828검색

laravel5源码讲解整理

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

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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<code class="php"><span class="line"><span class="o"><span class="nx">php<span class="line"><span class="sd">/**<span class="line"><span class="sd"> * Laravel - A PHP Framework For Web Artisans<span class="line"><span class="sd"> *<span class="line"><span class="sd"> * @package  Laravel<span class="line"><span class="sd"> * @author   Taylor Otwell <span class="line"><span class="sd"> */<span class="line"><span class="line"><span class="cm">/*<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">| Register The Auto Loader<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">|<span class="line"><span class="cm">| Composer provides a convenient, automatically generated class loader for<span class="line"><span class="cm">| our application. We just need to utilize it! We'll simply require it<span class="line"><span class="cm">| into the script here so that we don't have to worry about manual<span class="line"><span class="cm">| loading any of our classes later on. It feels nice to relax.<span class="line"><span class="cm">|<span class="line"><span class="cm">*/<span class="line"><span class="line"><span class="k">require <span class="nx">__DIR__<span class="o">.<span class="s1">'/../bootstrap/autoload.php'<span class="p">;<span class="line"><span class="line"><span class="cm">/*<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">| Turn On The Lights<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">|<span class="line"><span class="cm">| We need to illuminate PHP development, so let us turn on the lights.<span class="line"><span class="cm">| This bootstraps the framework and gets it ready for use, then it<span class="line"><span class="cm">| will load up this application so that we can run it and send<span class="line"><span class="cm">| the responses back to the browser and delight our users.<span class="line"><span class="cm">|<span class="line"><span class="cm">*/<span class="line"><span class="line"><span class="nv">$app <span class="o">= <span class="k">require_once <span class="nx">__DIR__<span class="o">.<span class="s1">'/../bootstrap/app.php'<span class="p">;<span class="line"><span class="line"><span class="cm">/*<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">| Run The Application<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">|<span class="line"><span class="cm">| Once we have the application, we can handle the incoming request<span class="line"><span class="cm">| through the kernel, and send the associated response back to<span class="line"><span class="cm">| the client's browser allowing them to enjoy the creative<span class="line"><span class="cm">| and wonderful application we have prepared for them.<span class="line"><span class="cm">|<span class="line"><span class="cm">*/<span class="line"><span class="line"><span class="nv">$kernel <span class="o">= <span class="nv">$app<span class="o">-><span class="na">make<span class="p">(<span class="nx">Illuminate\Contracts\Http\Kernel<span class="o">::<span class="na">class<span class="p">);<span class="line"><span class="line"><span class="nv">$response <span class="o">= <span class="nv">$kernel<span class="o">-><span class="na">handle<span class="p">(<span class="line">    <span class="nv">$request <span class="o">= <span class="nx">Illuminate\Http\Request<span class="o">::<span class="na">capture<span class="p">()<span class="line"><span class="p">);<span class="line"><span class="line"><span class="nv">$response<span class="o">-><span class="na">send<span class="p">();<span class="line"><span class="line"><span class="nv">$kernel<span class="o">-><span class="na">terminate<span class="p">(<span class="nv">$request<span class="p">, <span class="nv">$response<span class="p">);</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

第二十一行代码

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<code class="php"><span class="line"><span class="k">require <span class="nx">__DIR__<span class="o">.<span class="s1">'/../bootstrap/autoload.php'<span class="p">;</span></span></span></span></span></span></code>

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：

类继承结构

第三十五行代码

<span class="line-number">1</span>

<code class="php"><span class="line"><span class="nv">$app <span class="o">= <span class="k">require_once <span class="nx">__DIR__<span class="o">.<span class="s1">'/../bootstrap/app.php'<span class="p">;</span></span></span></span></span></span></span></span></code>

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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<code class="php"><span class="line"><span class="o"><span class="nx">php<span class="line"><span class="line"><span class="cm">/*<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">| Create The Application<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">|<span class="line"><span class="cm">| The first thing we will do is create a new Laravel application instance<span class="line"><span class="cm">| which serves as the "glue" for all the components of Laravel, and is<span class="line"><span class="cm">| the IoC container for the system binding all of the various parts.<span class="line"><span class="cm">|<span class="line"><span class="cm">*/<span class="line"><span class="line"><span class="nv">$app <span class="o">= <span class="k">new <span class="nx">Illuminate\Foundation\Application<span class="p">(<span class="line">    <span class="nb">realpath<span class="p">(<span class="nx">__DIR__<span class="o">.<span class="s1">'/../'<span class="p">)<span class="line"><span class="p">);<span class="line"><span class="line"><span class="cm">/*<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">| Bind Important Interfaces<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">|<span class="line"><span class="cm">| Next, we need to bind some important interfaces into the container so<span class="line"><span class="cm">| we will be able to resolve them when needed. The kernels serve the<span class="line"><span class="cm">| incoming requests to this application from both the web and CLI.<span class="line"><span class="cm">|<span class="line"><span class="cm">*/<span class="line"><span class="line"><span class="nv">$app<span class="o">-><span class="na">singleton<span class="p">(<span class="line">    <span class="nx">Illuminate\Contracts\Http\Kernel<span class="o">::<span class="na">class<span class="p">,<span class="line">    <span class="nx">App\Http\Kernel<span class="o">::<span class="na">class<span class="line"><span class="p">);<span class="line"><span class="line"><span class="nv">$app<span class="o">-><span class="na">singleton<span class="p">(<span class="line">    <span class="nx">Illuminate\Contracts\Console\Kernel<span class="o">::<span class="na">class<span class="p">,<span class="line">    <span class="nx">App\Console\Kernel<span class="o">::<span class="na">class<span class="line"><span class="p">);<span class="line"><span class="line"><span class="nv">$app<span class="o">-><span class="na">singleton<span class="p">(<span class="line">    <span class="nx">Illuminate\Contracts\Debug\ExceptionHandler<span class="o">::<span class="na">class<span class="p">,<span class="line">    <span class="nx">App\Exceptions\Handler<span class="o">::<span class="na">class<span class="line"><span class="p">);<span class="line"><span class="line"><span class="cm">/*<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">| Return The Application<span class="line"><span class="cm">|--------------------------------------------------------------------------<span class="line"><span class="cm">|<span class="line"><span class="cm">| This script returns the application instance. The instance is given to<span class="line"><span class="cm">| the calling script so we can separate the building of the instances<span class="line"><span class="cm">| from the actual running of the application and sending responses.<span class="line"><span class="cm">|<span class="line"><span class="cm">*/<span class="line"><span class="line"><span class="k">return <span class="nv">$app<span class="p">;</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

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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<code class="php"><span class="line"><span class="sd">/**<span class="line"><span class="sd"> * Create a new Illuminate application instance.<span class="line"><span class="sd"> *<span class="line"><span class="sd"> * @param  string|null  $basePath<span class="line"><span class="sd"> * @return void<span class="line"><span class="sd"> */<span class="line"><span class="k">public <span class="k">function <span class="nf">__construct<span class="p">(<span class="nv">$basePath <span class="o">= <span class="k">null<span class="p">)<span class="line"><span class="p">{<span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerBaseBindings<span class="p">();<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerBaseServiceProviders<span class="p">();<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerCoreContainerAliases<span class="p">();<span class="line"><span class="line">    <span class="k">if <span class="p">(<span class="nv">$basePath<span class="p">) <span class="p">{<span class="line">        <span class="nv">$this<span class="o">-><span class="na">setBasePath<span class="p">(<span class="nv">$basePath<span class="p">);<span class="line">    <span class="p">}<span class="line"><span class="p">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

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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<code class="php"><span class="line"><span class="sd">/**<span class="line"><span class="sd">  * Register the basic bindings into the container.<span class="line"><span class="sd">  *<span class="line"><span class="sd">  * @return void<span class="line"><span class="sd">  */<span class="line"><span class="k">protected <span class="k">function <span class="nf">registerBaseBindings<span class="p">()<span class="line"><span class="p">{<span class="line">    <span class="k">static<span class="o">::<span class="na">setInstance<span class="p">(<span class="nv">$this<span class="p">);<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">instance<span class="p">(<span class="s1">'app'<span class="p">, <span class="nv">$this<span class="p">);<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">instance<span class="p">(<span class="s1">'Illuminate\Container\Container'<span class="p">, <span class="nv">$this<span class="p">);<span class="line"><span class="p">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

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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<code class="php"><span class="line"><span class="sd">/**<span class="line"><span class="sd">  * Register an existing instance as shared in the container.<span class="line"><span class="sd">  *<span class="line"><span class="sd">  * @param  string  $abstract<span class="line"><span class="sd">  * @param  mixed   $instance<span class="line"><span class="sd">  * @return void<span class="line"><span class="sd">  */<span class="line"><span class="k">public <span class="k">function <span class="nf">instance<span class="p">(<span class="nv">$abstract<span class="p">, <span class="nv">$instance<span class="p">)<span class="line"><span class="p">{<span class="line">    <span class="k">if <span class="p">(<span class="nb">is_array<span class="p">(<span class="nv">$abstract<span class="p">)) <span class="p">{<span class="line">        <span class="c1">// $abstract 是这样的一个数组 ['actual key' => 'alias']<span class="line">        <span class="k">list<span class="p">(<span class="nv">$abstract<span class="p">, <span class="nv">$alias<span class="p">) <span class="o">= <span class="nv">$this<span class="o">-><span class="na">extractAlias<span class="p">(<span class="nv">$abstract<span class="p">);<span class="line"><span class="line">        <span class="c1">// 实际上的行为是 $this->aliases[$alias] = $abstract;<span class="line">        <span class="nv">$this<span class="o">-><span class="na">alias<span class="p">(<span class="nv">$abstract<span class="p">, <span class="nv">$alias<span class="p">);<span class="line">    <span class="p">}<span class="line"><span class="line">    <span class="nb">unset<span class="p">(<span class="nv">$this<span class="o">-><span class="na">aliases<span class="p">[<span class="nv">$abstract<span class="p">]);<span class="line"><span class="line">    <span class="c1">// 检查是否有这个键是否已经注册到容器中<span class="line">    <span class="c1">// $bound 是一个boolean值<span class="line">    <span class="nv">$bound <span class="o">= <span class="nv">$this<span class="o">-><span class="na">bound<span class="p">(<span class="nv">$abstract<span class="p">);<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">instances<span class="p">[<span class="nv">$abstract<span class="p">] <span class="o">= <span class="nv">$instance<span class="p">;<span class="line"><span class="line">    <span class="k">if <span class="p">(<span class="nv">$bound<span class="p">) <span class="p">{<span class="line">        <span class="nv">$this<span class="o">-><span class="na">rebound<span class="p">(<span class="nv">$abstract<span class="p">);<span class="line">    <span class="p">}<span class="line"><span class="p">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

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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<code class="php"><span class="line"><span class="sd">/**<span class="line"><span class="sd">  * Register all of the base service providers.<span class="line"><span class="sd">  *<span class="line"><span class="sd">  * @return void<span class="line"><span class="sd">  */<span class="line"><span class="k">protected <span class="k">function <span class="nf">registerBaseServiceProviders<span class="p">()<span class="line"><span class="p">{<span class="line">    <span class="nv">$this<span class="o">-><span class="na">register<span class="p">(<span class="k">new <span class="nx">EventServiceProvider<span class="p">(<span class="nv">$this<span class="p">));<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">register<span class="p">(<span class="k">new <span class="nx">RoutingServiceProvider<span class="p">(<span class="nv">$this<span class="p">));<span class="line"><span class="p">}<span class="line"><span class="line"><span class="sd">/**<span class="line"><span class="sd">  * Register a service provider with the application.<span class="line"><span class="sd">  *<span class="line"><span class="sd">  * @param  \Illuminate\Support\ServiceProvider|string  $provider<span class="line"><span class="sd">  * @param  array  $options<span class="line"><span class="sd">  * @param  bool   $force<span class="line"><span class="sd">  * @return \Illuminate\Support\ServiceProvider<span class="line"><span class="sd">  */<span class="line"><span class="k">public <span class="k">function <span class="nf">register<span class="p">(<span class="nv">$provider<span class="p">, <span class="nv">$options <span class="o">= <span class="p">[], <span class="nv">$force <span class="o">= <span class="k">false<span class="p">)<span class="line"><span class="p">{<span class="line">    <span class="k">if <span class="p">(<span class="nv">$registered <span class="o">= <span class="nv">$this<span class="o">-><span class="na">getProvider<span class="p">(<span class="nv">$provider<span class="p">) <span class="o">&& <span class="o">!<span class="nv">$force<span class="p">) <span class="p">{<span class="line">        <span class="k">return <span class="nv">$registered<span class="p">;<span class="line">    <span class="p">}<span class="line"><span class="line">    <span class="c1">// If the given "provider" is a string, we will resolve it, passing in the<span class="line">    <span class="c1">// application instance automatically for the developer. This is simply<span class="line">    <span class="c1">// a more convenient way of specifying your service provider classes.<span class="line">    <span class="k">if <span class="p">(<span class="nb">is_string<span class="p">(<span class="nv">$provider<span class="p">)) <span class="p">{<span class="line">        <span class="nv">$provider <span class="o">= <span class="nv">$this<span class="o">-><span class="na">resolveProviderClass<span class="p">(<span class="nv">$provider<span class="p">);<span class="line">    <span class="p">}<span class="line"><span class="line">    <span class="nv">$provider<span class="o">-><span class="na">register<span class="p">();<span class="line"><span class="line">    <span class="c1">// Once we have registered the service we will iterate through the options<span class="line">    <span class="c1">// and set each of them on the application so they will be available on<span class="line">    <span class="c1">// the actual loading of the service objects and for developer usage.<span class="line">    <span class="k">foreach <span class="p">(<span class="nv">$options <span class="k">as <span class="nv">$key <span class="o">=> <span class="nv">$value<span class="p">) <span class="p">{<span class="line">        <span class="nv">$this<span class="p">[<span class="nv">$key<span class="p">] <span class="o">= <span class="nv">$value<span class="p">;<span class="line">    <span class="p">}<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">markAsRegistered<span class="p">(<span class="nv">$provider<span class="p">);<span class="line"><span class="line">    <span class="c1">// If the application has already booted, we will call this boot method on<span class="line">    <span class="c1">// the provider class so it has an opportunity to do its boot logic and<span class="line">    <span class="c1">// will be ready for any usage by the developer's application logics.<span class="line">    <span class="k">if <span class="p">(<span class="nv">$this<span class="o">-><span class="na">booted<span class="p">) <span class="p">{<span class="line">        <span class="nv">$this<span class="o">-><span class="na">bootProvider<span class="p">(<span class="nv">$provider<span class="p">);<span class="line">    <span class="p">}<span class="line"><span class="line">    <span class="k">return <span class="nv">$provider<span class="p">;<span class="line"><span class="p">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

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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<code class="php"><span class="line"><span class="k">public <span class="k">function <span class="nf">register<span class="p">()<span class="line"><span class="p">{<span class="line">    <span class="nv">$this<span class="o">-><span class="na">app<span class="o">-><span class="na">singleton<span class="p">(<span class="s1">'events'<span class="p">, <span class="k">function <span class="p">(<span class="nv">$app<span class="p">) <span class="p">{<span class="line">        <span class="k">return <span class="p">(<span class="k">new <span class="nx">Dispatcher<span class="p">(<span class="nv">$app<span class="p">))<span class="o">-><span class="na">setQueueResolver<span class="p">(<span class="k">function <span class="p">() <span class="k">use <span class="p">(<span class="nv">$app<span class="p">) <span class="p">{<span class="line">            <span class="k">return <span class="nv">$app<span class="o">-><span class="na">make<span class="p">(<span class="s1">'Illuminate\Contracts\Queue\Factory'<span class="p">);<span class="line">        <span class="p">});<span class="line">    <span class="p">});<span class="line"><span class="p">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

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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<code class="php"><span class="line"><span class="k">public <span class="k">function <span class="nf">register<span class="p">()<span class="line"><span class="p">{<span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerRouter<span class="p">();<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerUrlGenerator<span class="p">();<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerRedirector<span class="p">();<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerPsrRequest<span class="p">();<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerPsrResponse<span class="p">();<span class="line"><span class="line">    <span class="nv">$this<span class="o">-><span class="na">registerResponseFactory<span class="p">();<span class="line"><span class="p">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

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