laravel5源码讲解整理

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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

<?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

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

<?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

/**

 * 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

/**

  * 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

/**

  * 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

/**

  * 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

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

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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