下面由laravel教程栏目给大家介绍Laravel的$this->app以及app()是怎么来的，希望对需要的朋友有所帮助！

断点调试寻找对应文件，忽略次要步骤，仅描述核心动作，‘/’表示index.php所在目录

地址:index.php

$app = require_once __DIR__.'/../bootstrap/app.php';

$app初始化

路径/…/bootstrap/app.php

$app = new Illuminate\Foundation\Application(    realpath(__DIR__.'/../'));//$app初始化工作

$app初始化的类及构造函数

class Application extends Container implements ApplicationContract,HttpKernelInterface{    //继承Container类，Container类实现应用契约接口与请求接口    public function __construct($basePath = null){       if ($basePath) {//$basePath = '/../'           $this->setBasePath($basePath);//路径绑定       }       $this->registerBaseBindings();//基础绑定       $this->registerBaseServiceProviders();//注册基础服务提供者       $this->registerCoreContainerAliases();//注册别名    }}

路径绑定

Application的setBasePath(’/…/’)方法调用Container的instance(a b s t r a c t , abstract,abstract,instance)方法赋值Contaienr类instancesinstances: array:9 [▼“path” => “\var\www\app”“path.base” => “\var\www”“path.lang” => “\var\www\resources\lang”“path.config” => “\var\www\config”“path.public” => “\var\www\public”“path.storage” => “\var\www\storage”“path.database” => “\var\www\database”“path.resources” => “\var\www\resources”“path.bootstrap” => “\var\www\bootstrap”]

基础绑定

向Container的instances中添加绑定

    "app" => Application {#2}      "Illuminate\Container\Container" => Application {#2}      "Illuminate\Foundation\PackageManifest" => PackageManifest {#4 ▼            +files: Filesystem {#5}            +basePath: "\var\www"            +vendorPath: "\var\www\vendor"            +manifestPath: "\var\www\bootstrap\cache\packages.php"            +manifest: null        }

app与Container指向当前实例

PackageMainfest 为包管理实例，构造方法中files注册文件系统实例

注册基础服务提供者

//class Applicationprotected function registerBaseServiceProviders(){    $this->register(new EventServiceProvider($this));    $this->register(new LogServiceProvider($this));    $this->register(new RoutingServiceProvider($this));}

Event、Log、Routing基础服务继承ServiceProvider，初始化的时候将app属性赋值Application实例

//class ServiceProvider    public function __construct($app){    $this->app = $app;}

执行Application类register方法

//Applicationpublic function register($provider, $options = [], $force = false){    if (is_string($provider)) {        $provider = $this->resolveProvider($provider);    }    if (method_exists($provider, 'register')) {        $provider->register();//赋值bindings    }    //将服务提供者添加到serviceProviders属性队列    //将服务提供者类名添加到loaderProviders属性    $this->markAsRegistered($provider);    return $provider;}

为provider注册提供了两种方法；

一种是字符串类名直接实例，

一种是执行$$provider->register()方法注册，

当前执行第二种方法，

回看当前EventServiceProvider实例的register方法

public function register(){    $this->app->singleton('events', function ($app) {        return (new Dispatcher($app))->setQueueResolver(function () use ($app) {            return $app->make(QueueFactoryContract::class);        });    });}

调用Application实例的singleton方法

//class Continerpublic function singleton($abstract, $concrete = null){    $this->bind($abstract, $concrete, true);}

调用bind方法，赋值bindings

//class Containerpublic function bind($abstract, $concrete = null, $shared = false){    if (is_null($concrete)) {        $concrete = $abstract;    }    if (! $concrete instanceof Closure) {        $concrete = $this->getClosure($abstract, $concrete);    }    $this->bindings[$abstract] = compact('concrete', 'shared');}

回到Application类register方法中并执行markAsRegistered($provider)

//class Applicationprotected function markAsRegistered($provider){    $this->serviceProviders[] = $provider;    $this->loadedProviders[get_class($provider)] = true;}

LogServerProvider、RoutingServiceProvider与之类似

别名绑定

//class Applicationpublic function registerCoreContainerAliases(){    foreach ([        'app'                  => [self::class, \Illuminate\Contracts\Container\Container::class, \Illuminate\Contracts\Foundation\Application::class,  \Psr\Container\ContainerInterface::class],        'auth'                 => [\Illuminate\Auth\AuthManager::class, \Illuminate\Contracts\Auth\Factory::class],        'auth.driver'          => [\Illuminate\Contracts\Auth\Guard::class],        'blade.compiler'       => [\Illuminate\View\Compilers\BladeCompiler::class],        'cache'                => [\Illuminate\Cache\CacheManager::class, \Illuminate\Contracts\Cache\Factory::class],        'cache.store'          => [\Illuminate\Cache\Repository::class, \Illuminate\Contracts\Cache\Repository::class],        'config'               => [\Illuminate\Config\Repository::class, \Illuminate\Contracts\Config\Repository::class],        'cookie'               => [\Illuminate\Cookie\CookieJar::class, \Illuminate\Contracts\Cookie\Factory::class, \Illuminate\Contracts\Cookie\QueueingFactory::class],        'encrypter'            => [\Illuminate\Encryption\Encrypter::class, \Illuminate\Contracts\Encryption\Encrypter::class],        'db'                   => [\Illuminate\Database\DatabaseManager::class],        'db.connection'        => [\Illuminate\Database\Connection::class, \Illuminate\Database\ConnectionInterface::class],        'events'               => [\Illuminate\Events\Dispatcher::class, \Illuminate\Contracts\Events\Dispatcher::class],        'files'                => [\Illuminate\Filesystem\Filesystem::class],        'filesystem'           => [\Illuminate\Filesystem\FilesystemManager::class, \Illuminate\Contracts\Filesystem\Factory::class],        'filesystem.disk'      => [\Illuminate\Contracts\Filesystem\Filesystem::class],        'filesystem.cloud'     => [\Illuminate\Contracts\Filesystem\Cloud::class],        'hash'                 => [\Illuminate\Contracts\Hashing\Hasher::class],        'translator'           => [\Illuminate\Translation\Translator::class, \Illuminate\Contracts\Translation\Translator::class],        'log'                  => [\Illuminate\Log\Writer::class, \Illuminate\Contracts\Logging\Log::class, \Psr\Log\LoggerInterface::class],        'mailer'               => [\Illuminate\Mail\Mailer::class, \Illuminate\Contracts\Mail\Mailer::class, \Illuminate\Contracts\Mail\MailQueue::class],        'auth.password'        => [\Illuminate\Auth\Passwords\PasswordBrokerManager::class, \Illuminate\Contracts\Auth\PasswordBrokerFactory::class],        'auth.password.broker' => [\Illuminate\Auth\Passwords\PasswordBroker::class, \Illuminate\Contracts\Auth\PasswordBroker::class],        'queue'                => [\Illuminate\Queue\QueueManager::class, \Illuminate\Contracts\Queue\Factory::class, \Illuminate\Contracts\Queue\Monitor::class],        'queue.connection'     => [\Illuminate\Contracts\Queue\Queue::class],        'queue.failer'         => [\Illuminate\Queue\Failed\FailedJobProviderInterface::class],        'redirect'             => [\Illuminate\Routing\Redirector::class],        'redis'                => [\Illuminate\Redis\RedisManager::class, \Illuminate\Contracts\Redis\Factory::class],        'request'              => [\Illuminate\Http\Request::class, \Symfony\Component\HttpFoundation\Request::class],        'router'               => [\Illuminate\Routing\Router::class, \Illuminate\Contracts\Routing\Registrar::class, \Illuminate\Contracts\Routing\BindingRegistrar::class],        'session'              => [\Illuminate\Session\SessionManager::class],        'session.store'        => [\Illuminate\Session\Store::class, \Illuminate\Contracts\Session\Session::class],        'url'                  => [\Illuminate\Routing\UrlGenerator::class, \Illuminate\Contracts\Routing\UrlGenerator::class],        'validator'            => [\Illuminate\Validation\Factory::class, \Illuminate\Contracts\Validation\Factory::class],        'view'                 => [\Illuminate\View\Factory::class, \Illuminate\Contracts\View\Factory::class],    ] as $key => $aliases) {        foreach ($aliases as $alias) {            $this->alias($key, $alias);        }    }}

为alias属性赋值

$app核心类绑定

/…/bootstrap/app.php/** *核心类绑定 */$app->singleton(    Illuminate\Contracts\Http\Kernel::class,    App\Http\Kernel::class);$app->singleton(    Illuminate\Contracts\Console\Kernel::class,    App\Console\Kernel::class);$app->singleton(    Illuminate\Contracts\Debug\ExceptionHandler::class,    App\Exceptions\Handler::class);

调用bind函数

//class Containerpublic function singleton($abstract, $concrete = null){    $this->bind($abstract, $concrete, true);}

对字符串类名进行默认回调函数绑定

//class Containerpublic function bind($abstract, $concrete = null, $shared = false){    // If the factory is not a Closure, it means it is just a class name which is    // bound into this container to the abstract type and we will just wrap it    // up inside its own Closure to give us more convenience when extending.    if (! $concrete instanceof Closure) {        $concrete = $this->getClosure($abstract, $concrete);    }    $this->bindings[$abstract] = compact('concrete', 'shared');}

getClosure返回默认回调函数

//class Containerprotected function getClosure($abstract, $concrete){    return function ($container, $parameters = []) use ($abstract, $concrete) {        if ($abstract == $concrete) {            return $container->build($concrete);        }        return $container->make($concrete, $parameters);    };}

最终：返回$app

/…/bootstrap/app.phpreturn $app;

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